Hi guys glad to be here, I’ve been a hobby watch builder for years mainly machining my own cases and parts. I’m hoping to gain more knowledge on repairing and servicing my movements... look forward to chatting, thanks
Glad to read the good points made here.
If you contrast the danger of damaging the valuable hairspring against having a moderate beat error (that means almost nothing), guess what my advice is?
I use plug gages, which are in 0.01mm increments, but they are expensive. If you need to measure the hole in the hand and can't measure the pivot (and a micrometer will easily differentiate between 0.25 and 0.27mm, you can easily see a difference of 0.005mm), you can use a small broach. Slide the hand on until it stops, and measure there. There's a little interpolation to do, but you will be very close.