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Prewar Gibson 1/2” rim adding upper coordinator rod

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Sep 26, 2020 - 7:55:49 AM

Brett

USA

2338 posts since 11/29/2005

Throwing together a light weight banjo with prewar Gibson 1/2” thin rim, wood bead only. One piece pot metal flange, pot metal tension hoop, prewar presto. Kalamazoo reso.
Because the mass of the newer neck is greater than orig neck and tuners, I’d like to add upper rim hole to accommodate upper coordinator rod. I know people frequently add upper coordinator rod to many older Gibson rims that just had the upper nut.

If anyone has 1/2” rim upper coordinator rod can you comment and provide estimate of how deep you drilled?

Sep 26, 2020 - 7:58:17 AM

Brett

USA

2338 posts since 11/29/2005

OR, would you use a lighter neck and not add upper rod. I do have a neck I’d have to final sand and stain but it’s alot lighter mahogany than the curly maple Flinthill neck I was gonna use. The Flinthill neck is uncommonly beefy, it’s a scout copy. It’s a substantial neck.

Sep 26, 2020 - 8:26:37 AM

3325 posts since 5/29/2011

I try to drill the hole about half the depth of the rim.(I hope that made sense.) That is subjective to how long the upper rod is. Some hardware makers expect the rod to be used on a 3/4" rim so the rod may be too short. I have run into that situation several times.

Sep 26, 2020 - 9:37:22 AM

1080 posts since 5/19/2018

Brett- owning an all original RB-00, pretty much the exact same configuration that you are describing, you really don’t need that second coordinator rod. I don’t think it’s going to add anything to the tone, and if you cut the neck right, the fit and action should be perfect.

R-250’s, 100’s and the like also perform fine with just a single coordinator.

Go with just the one rod, put it together and see how it sounds and go from there.

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