Relearning after setting it down for 20 years and taking a stroll into other strings (mostly guitar and bass). Thanks to quarantine I made the decision to get back into violin. Luckily my dad had the one that I learned on back when I was a boy: the family violin.

This thing is my grandfather's first violin, appears to be from the 1920's by the little digging I did on the model. I'm the 3rd generation to learn on this, and aside from some cosmetic imperfections, she sounds pretty good still.

The issue I'm running into is that there is some where in the finish under the feet of the bridge and it appears to be able to slip slightly within that wear. The variance is approx 2-4mm, and it seems to pull slightly towards the G side of the bridge.

My worry is partially for the health of the instrument but also for my own technique. If I'm having to make postural corrections to compensate for the skew, will it mess with my muscle memory in the long run?

How can I overcome this issue with my current instrument?

TL;dr: family violin has wear under the bridge that's causing it to slip, possibly impacting play. Please send help