Repair a split tuning peg
I snapped the tuning peg on the lowest string on my fiddle a while ago, trying to free it when it was jammed. A better way to free jammed pegs is to tap them out axially with a dowel rather than trying to twist them out.
I never did make a peg shaver and reamer for these pegs. The holes were drilled in discrete steps and the pegs were whittled and eyeballed to size with a drill bit gauge. Other than the split head, the peg was in fine shape, so I tried pinning it back together.
I made the pins from bamboo because it is hard, stiff, tough, and cheap. I split off a small section with my knife and removed material until it matched the hole I’d just drilled.
I fitted the pins to one peg-half, then used their locations to mark and drill holes on the other peg half.
Works just fine.