So after just over a year of running happily at 250Mhz in mineral oil, I decided to pull my 2pac out and give it a clean to try air cooling again.

I gave it a quick rinse in 99% Isopropyl Alcohol and while drying, I noticed a portion of the white insolating material from the voltage adjustment pot had come out.  Not sure what this material is made of... is it possible the mineral oil degraded it?

My main question is, what is the value of this potentiometer?

Given it's currently running at 200Mhz along side it's new sibling (a Newpac at 400Mhz), should I just be happy and leave well-enough alone?