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 ARCHIVED TOPIC: 1931 GB-1, Factory or MacGyver Mod?


Please note this is an archived topic, so it is locked and unable to be replied to. You may, however, start a new topic and refer to this topic with a link: http://www.banjohangout.org/archive/383143

550Spyder - Posted - 05/11/2022:  09:36:51


The banjo appears to be all original with the exception of the head and bridge. The flange was modified and the question is: was it done by the factory or someone after the fact? The two holes closest to the neck were plugged and re-drilled. The neck notch of the flange was also widened compared to a regular flange.





 

csacwp - Posted - 05/11/2022:  10:40:15


Looks like a factory job to me. They wouldn't have gone to the trouble to cast special flanges for the GB's, so they modified a standard flange to accommodate the wider neck.

kyleb - Posted - 05/11/2022:  10:50:22


quote:

Originally posted by csacwp

Looks like a factory job to me. They wouldn't have gone to the trouble to cast special flanges for the GB's, so they modified a standard flange to accommodate the wider neck.






every gb1 ive seen had a standard flange, modified only to be wider at the neck , but no changes to the holes. Maybe it was just a stamping error and fixed , i do agree it would be factory but im leaning more towards fixing it due to manufacturing error. 



heres another gb1 with a good view of the flange.  earnestbanjo.com/wp/wp-content...nside.jpg

Barretone - Posted - 05/11/2022:  19:01:05


It's got a notched stretcher band from 1925. Interesting.

mikehalloran - Posted - 05/12/2022:  00:05:39


quote:

Originally posted by Barretone

It's got a notched stretcher band from 1925. Interesting.






No, that's a grooved stretcher—as it should be.

Leslie R - Posted - 05/12/2022:  06:26:03


This is the original flange from a 1931 GB1, from 9970.
The tension hook holes are 36mm apart, Except for the two closest to the neck. Those are 31 mm from it adjacent hole.



 

550Spyder - Posted - 05/12/2022:  06:38:21


quote:

Originally posted by Leslie R

This is the original flange from a 1931 GB1, from 9970.

The tension hook holes are 36mm apart, Except for the two closest to the neck. Those are 31 mm from it adjacent hole.






Thanks for the picture and measurement.  A typical flange notch would be rounded near the bead however yours is squared off too.  Does the underside show that the two holes were re-drilled?

Leslie R - Posted - 05/12/2022:  07:03:16


quote:

Originally posted by 550Spyder

quote:

Originally posted by Leslie R

This is the original flange from a 1931 GB1, from 9970.

The tension hook holes are 36mm apart, Except for the two closest to the neck. Those are 31 mm from it adjacent hole.






Thanks for the picture and measurement.  A typical flange notch would be rounded near the bead however yours is squared off too.  Does the underside show that the two holes were re-drilled?






Yes it does.



Would you mind sharing which order number lot (if this is the correct term) your banjo came from?



 



 



 

550Spyder - Posted - 05/12/2022:  07:33:44


Also 9970. Your info is very helpful. Thanks

Banjo40 - Posted - 05/17/2022:  13:46:46


If the two holes were modified for the GB neck it would necessitate the use of grooved stretcher band it seems since the notched stretcher band would not be in alignment with the new holes.

550Spyder - Posted - 05/17/2022:  15:01:54


The grooved stretcher band in order to accommodate the neck certainly makes sense.

The conclusion is the holes were drilled by the factory where it was invaluable to see Leslie's similar flange from the same batch with back to back numbers.

I also found out from a very reliable source that the drilled holes are common. Because of it though they aren't the best for a 5-string conversion or have as much value because of the widened notch and grooved band and flat hooks. A plus from a 5-string perspective is the original redline case.

Jbo1 - Posted - 05/17/2022:  15:15:16


550Spyder , so.... throw out the banjo and keep the case?

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