1:25 reamer for installing Wittner geared cello pegs
thingiverse
STL is one half of a reamer I used for enlarging holes to install geared pegs in cello. Firstly, wrap two printed halves in aluminum foil so they don't melt. Insert sand paper in between two halves then wrap around it them fully (cut at angle so it covers the dowel equally). Attach to a drill and sand away w/o much force. Not for a faint of heart. No guarantees it works. For 14mm Wittner pegs, 1:25 taper Best to use cloth backed sandpaper or for wet sanding as they are more flexible.
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