Don't know if this applies but it might, and I guess it's related.

I just put Perfection pegs into my viola and they are mighty, mighty fine. I don't like the little tuners behind the bridge, they muffle the voice of the fiddle a little. I just used regular pegs for years, got so I could tune it more or less, but once tuned I'd be reluctant to tweek it let alone tune it off to some other cross tuning. Stick and slip is a bad thing.

P. pegs are Really Tricky to install. I actually broke two getting them in, but I was able to glue them back together.

The first trick is to measure the holes using a caliper. You can get a working one for 5 dollars in the bargain bin at the hardward store. Plastic, made in China, but works. You can measure a few known things like metal rods and sheets and get an idea of the accuracy. The pegs come in several sizes and there are instructions on how to figure what size.

Second trick is, go real slow and deliberate. Think about each step, don't be in any hurry, try to practice each step on something of less value first. There are some videos on how to install P. pegs on Youtube, some of which are nonsense but it gets you seeing some problems in advance.

Third trick, the pegs come in a left and right chirality - two pegs for the tenor side, two for the bass side. They have a one-way friction feature. Get 'em swapped and they will not hold. Figure out which is which, very deliberately, and stick gummed labels on 'em, so can't get 'em swapped. You can tighten the friction by pushing the peg in a little, and loosen it the opposite.

4th, find a luthier and borrow his reamer(s). I was able to get two, a 1-degree reamer and a 3-degree. Just lightly turn the reamer in the hole, it works real aggressive, about two turns and you've widened the hole past ever having it work again. I pushed it in real soft and gave it a quarter turn, and repeating that one or two times more, was all the new pegs needed.

5th trick, I had to ream out the two sides of the pegbox a little differently. It really needs a special reamer, but that doesn't exist. I tried the 1-degree reamer, and the peg jammed in the hole at the small end, and broke when I turned it. The 3-degree would have been worse, it needs a 1/2-degree reamer which are only made out of Unobtainium. And in spite of my best care it happened again on the next peg. I glued together the broken pegs and reamed out the small end from the other side, got it working, and by the luck of the Irish this worked out OK.

The manufacturer sez just go find a luthier and have them install them, but problem is back here in the woods with no income, and no prospects of any soon, it's be my own luthier or have none.

So how did I manage to afford the pegs, you will ask. Well, I have two sons, and one of them ordered the pegs for me as a present.

The pegs are absolutely beautiful. I did not trim off the ends; they work fine as-is and I don't care too much about cosmetics. They work so well it almost makes me cry. I can tweek the tuning all I want and they just make it easy. Thank God for Chuck Herin, the inventor.