Sprocket nut...

[agricola]

When I did mine I brought the proper stuff which is expensive for a couple of drops needed.At the time I searched and searched and could not find anywhere that sold small amounts. Something like this size or even smaller would be perfect

Had to use a drop of Loctite tins morning on a trailer ramp mod, most of it well over 20 years old i'd say since its 10 years since I quit work. In with the others was a small bottle, so they must have made them at some point in the past. Does this stuff go off with time?