How to install Wittner geared pegs

Here’s an instructional video I put together for installing Wittner geared pegs in a cello. The same principles can be applied to violin and viola Wittner peg installation as well. Peg reamer is 1:25 taper We are using 10.8mm pegs for a 1/2 size cello. I recommend using the smallest size peg that will work on your instrument to avoid removing more wood than is necessary. The 12.5 is the common size for 4/4 cellos. Although the peg is called a 12.5 you ream less wood out than you do for a 12 mm Knilling peg. The pegs push in quite a bit further than one would expect so go slow and check often. Generally about 1/3 rd the way into the second (smaller) pegbox hole is enough but it could be less or more depending on the thickness of the peg box wall.