@bartafb, I’ve changed out my tuners for Rickard’s and my old 5th string tuner had the fin. But I was replacing Gotoh’s, and the 5th string Rickard is actually made by Gotoh (but with a Rickard symbol). So it was an easy one-for-one replacement. Not sure how the wood would respond without a precut notch–but it would certainly be stressful to attempt after all the hard work creating the neck. Regarding the glue, I was warned that I might have trouble removing the old tuner. I was happy to see that they didn’t glue it in–it just required a little effort to pull it. So I didn’t apply any glue when installing the Rickard either, and it seems to be solidly in place. But I’ve heard of some 5th string tuners that pop out at times, so Jeff Watts (@5-StringPilgrim) probably has the better advice. He’s generally smarter than I am at this banjo stuff anyway.