[SML] What is this cap called?

[billn at peak.org]

> See, that's the problem - the connection to the cap is riveted on, and
> I can't merely drill out the rivet and rivet a new chain on - inside
> the cap is a rubber seal, and anything that protrudes into the cap
> will interfere with the rubber seal, and in turn poke into the
> connectors... it would need to be flush, like the factory-applied
> rivet that was (is) there now. Replacing the chain is the hope, but I
> can't figure out a way to do that without using user-serviceable
> mechanical fasteners on the cap side.

An even easier solution, but not as elegant, would be simply to epoxy the end
of a replacement chain to the cap.

Bill