Thread sealer/ locker on PRW rocker shaft ends

The correct Loctite product would probably be #545 which is used on hydraulic fitttings. It's not real cheap. Having said that, I would put a good coat of commonly available Permatex #1 on the threads and send it. I've used #1 to repair about three dozen BMW cast aluminum oil pans and the repair bushing I make is threaded into the pan with #1 on the threads. No leaks.

As a matter of fact, I have a set of those rockers that will get a correction kit, and I WILL use #1 on the plugs.