Other Hy-SCore 800 refurb

Hello All,

New to the forum and I purchased a Hy-Score 800 that needs some TLC. I've stripped the gun down and started cleaning.
I've run across an issue. The red thread locker (part # 849 - Cylinder cover lock) has deteriorated and I was wondering what others have used in its place.

Hy-Score-02.jpg
Hy-Score-03.jpg

TIA,
Muggs