So judging by the bottom of the neck around the heel someone at some point has cut a section out? As you can see it does not sit flush.
It has been suggested to slot a wedge or 2 under the neck on the fret side to straighten it up and bring the neck in line with the body, yeah the action is a little high.
Another issue is that the bracket screws inside the pot that lie against the inside of the pot will not lie flush in the indents.
The dowel stick may be pulled out of the neck, or the pot out of round.
Measure across the pot 2 to 4 times to check its roundness.
What you've got there is someone's hack job.
Shims might work, but since the end of the heel is irregular, it would be difficult to get a good fit.
The right way to fix the heel would be to flatten the end, graft on a new piece, re-fit the neck to the banjo. and cross your fingers that the dowel was installed at the correct angle for decent action with a bridge of reasonable height. A trick that might save some hair-pulling would be to radius the graft and adjust its angle before glueing it to the heel. It would take a good bit of woodworking skill to do a decent job.
The neck stabilizer appears to be two mis-matched pieces of different sizes. I would advise making a new piece to replace the part that fits against the pot. The new piece could probably be made out of slightly thinner stock than the the old piece.
Edited by - rcc56 on 09/21/2023 15:54:26
It's also a stacked heel piece, so it could easily be cut of square and a new one glued on. A neck sled is a useful device.
rcc56 is right on about how to remedy some one else's impatience and lack of forethought.
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