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Philadelphia bridge conversion.

posted Apr 23, 2014 12:05:53 by GsxJones
I ordered a set of bridge post's and an ABR-1 bridge from Phili luthier store in the US,which came today in the post.
The new bridge post's are a really really slack fit into the ABR-1 bridge. Not good.
The ABR-1 came with it's own bridge posts and they are also mega slack and sloppy.
I need to think what to do next?
I know once the string tension is holding the bridge down it shouldnt move,but the difference in size's of the holes and bridge post's is massive.
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28 replies
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GsxJones said Apr 23, 2014 12:15:20
Ive just checked a LP custom Im working on,and the bridge on that is "sloppy". For some reason I expected a fairly good tight fit.
Luckily I have a lathe. lol. If it looks like Im going to have any issues,I'll turn a pair of bridge hole inserts to close the gap. But its a bit of a mess on for something I thought was an easy swop.
The bridge they've supplied is a Japanese ABR-1. Im not too fussed,but I thought Id ordered an American one.
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GsxJones said Apr 23, 2014 12:16:24
Im going to loosen the string tension on another LP std ( a real Gibson USA model)later when I get a chance,to feel the fit of the bridge on that one. For comparisons.
[Last edited Apr 23, 2014 12:17:06]
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vambostrausser said Apr 23, 2014 19:08:09
To take up any play,I use adhesive copper shielding tape,but PTFE tape would be a good substitute,or aluminium foil come to think of it.
THE CUSTOMER IS ALWAYS RIGHT,THE GIRL IS MUCH TOO YOUNG TO KNOW THE DIFFERENCE
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MichaelWamback said Apr 23, 2014 20:26:38
This is why I love Tonepros so much. They drill holes in the bridge and install a small pair of hex adjusting set screws. It clamps the bridge securely to the posts, taking up any slack. Makes everything rock solid.
The two most important things to remember in life: "The only time it's acceptable to work with amateurs is if you are making porn." "If you want to work with clowns, join a circus."
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rigidrecords said Apr 30, 2014 20:08:52
@MichaelWamback Do Tonepros bridges fit on Chibbys? I'm looking for a replacement bride of better quality, but hopefully without the labor involved.
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MichaelWamback said May 01, 2014 01:38:35
I've used Tonepros metic (large post) brides as a direct swap on Epiphone guitars with a perfect fit, so I would be willing to bet they would fit a Chibson. The pre-notched bridges are a really easy upgrade, and their quality is excellent. You'll tell the difference just by picking it up.
The two most important things to remember in life: "The only time it's acceptable to work with amateurs is if you are making porn." "If you want to work with clowns, join a circus."
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littlericky said May 01, 2014 17:44:59
I just did the same thing, I should've hit the board first :)
the conversion post threads are 6-32(M3.5)and the supplied bridge post threads are 4M so it makes sense.







Has anyone tried a USA bridge on imports. the spacing is off a bit (a 32nd"):
2 29/32" stud spacing for the import 2 28/32" for the USA
but the supplied posts are 6-32 so I imagine the post holes are smaller.
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HtesJoseph said Jun 15, 2014 03:05:11
sitting here with the bridge off the guitar and a ruler,I would love a tone pro or a roller but don't really know what or where to mesure,any guidance would be really appriciated
My band page on Facebook, The Damn Hippies. Like it if you like it. (*};=/ https://www.facebook.com/TheDamnHippies
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MichaelWamback said Jun 15, 2014 15:29:52
Most important measurement is your center to center post distance, and your post diameter.

If you are going Tonepros (Gotoh) you can order their large post "metric" bridge and it should drop right on to your existing poles. Otherwise you will have to use some conversion posts. Be aware that Nashville bridges and ABR-1 bridges (Gibson spec) have slightly different size posts.

Tonepros has the advantage of the set screws that lock the bridge to the post.
The two most important things to remember in life: "The only time it's acceptable to work with amateurs is if you are making porn." "If you want to work with clowns, join a circus."
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AdamLondon said Jun 15, 2014 15:33:13
I just received my posts from Philadelphia too but before buying the bridge can anybody tell me if it's easy to notch the saddles? I am really not confident doing this. I've seen some bridges pre notched but maybe they will mess up the set up.
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HtesJoseph said Jun 15, 2014 15:42:09

These things hard to measure ? If I'm off a 32 th of an inch things get all screwed up?
My band page on Facebook, The Damn Hippies. Like it if you like it. (*};=/ https://www.facebook.com/TheDamnHippies
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HtesJoseph said Jun 15, 2014 15:49:18
These are millimeters I think, would this be one of the measurements ?
My band page on Facebook, The Damn Hippies. Like it if you like it. (*};=/ https://www.facebook.com/TheDamnHippies
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HtesJoseph said Jun 15, 2014 17:13:52
I feel I am making this way harder than it needs to be...HA!! wait till I try to do the pots and caps and wiring,you guys are gonna go outta your minds,I actually may leave that to a pro,as the supreme has no acces in the back
My band page on Facebook, The Damn Hippies. Like it if you like it. (*};=/ https://www.facebook.com/TheDamnHippies
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kaarel804 said Jun 15, 2014 18:38:34
I'm also a bit concerned about notching the saddles, but I found a very cheap set of nut files on eBay from gbgitty's store. I think I'm going to buy that set for 10 bucks because I'll get my pots and strings from them anyway :)

link: http://www.ebay.com/itm/Cigar-Box-Guitar-Tools-Long-shaft-Nut-Bridge-File-Set-40-01-01-/181374582875?pt=Guitar_Accessories&hash=item2a3ac4805b

Looks like it can do the job, doesn't it? :)
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MichaelWamback said Jun 15, 2014 22:02:38
Those are small files that welders use to clean the tips of their torches. From what I've read, they will sort of work but reviews of them have been pretty mixed. Might work on a nut, but not sure they are ideal for a bridge.

I've not had to notch a bridge, since I usually buy Tonepros pre-notched bridges. But the theory is pretty basic.f

Use an old set of strings, since you will trash them.

Put the new bridge on the guitar and position the strings on the bridge under a bit of tension. Then use a small hammer and give the strings a few taps. It will actually leave a mark on the saddle. (This won't really work with wound strings.) You then remove the strings and file the saddles where the mark is.

I've thought about this, and you could use a set of .010 strings for this. You can get a set by Rogue or C.B.Gitty for a few bucks per dozen. Put the .010 strings on every tuner and lay them all on the bridges - and tap all of them. It will mark ever saddle perfectly for you.

Needless to say, the strings you use are going to be trash after your done smacking with a hammer.

The notches in the bridge don't need to be overly deep. If you look at Tonepros, the notches are just deep enough to grab the bottom of the string to keep it in place.
The two most important things to remember in life: "The only time it's acceptable to work with amateurs is if you are making porn." "If you want to work with clowns, join a circus."
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