On Monday, March 11, 2019 at 9:52:53 PM UTC-4, Roy B. wrote:
Dan:
For some reason the O-Rings on my South African glider get really dry & stiff. We use a very light coat of silicone "plumbers grease" on the probe about twice a year to fix that (petroleum based grease attacks the O-Ring). My US glider in Massachusetts doesn't have the problem.
ROY

If everyone used this, we'd have fewer problems: https://www.amazon.com/Dow-Corning-V.../dp/B001UHMNW0

What I use on the o-rings I rely on in my day job, as well as my triple probe socket.

T8