I'm trying to build a neck to fit this pot. How many inches from the the heel on the neck should it be from the bottom of the rim?
You'll have to try again with a photo of the pot. As a rule, the heel can be from flush with the bottom of the rim to 1/4 in or so above. If flush, it will look better if the bottom surface of the heel is parallel to the plane of the bottom of the pot.
I agree with mbanza but, cosmetically, it is more important on an open back banjo where all of the heel is visible.
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