Chainsaw Repair

The o-rings are a good solution, as noted.

I tried using a typical lithium-based, multi-purpose grease on the seams of the filter, but it wouldn't stay congealed enough to suit me. So, I got some synthetic grease for brakes, made by VersaChem, Part No. 26189, that's hi-temp, and it holds the viscosity better. Put some all the way around the side that has the groove in it, filling the groove. When the halves are put together, the grease squishes out, leaving behind what's needed to add to the seal. Wipe off the outside, and you're done.

Thought about taping the outside, but thought to try the grease first. Working fine (no pun intended), so far.