On Thu, 8 Oct 2020 00:13:03 +0100, Fredxx wrote:

This will be external use where one I have one telescopic style of an
extension piece, where one box section slides in another, and a swivel
joint.

So far I was thinking of PTFE grease. I can't find any graphite grease
locally but see that Screwfix does a Molyslip type grease.

What would be best?

Whatever you use, just a thin smear. I used too much grease on an acme
thread of about 1" dia. and it locked up. Eventually got it apart, removed
almost all of the grease and it was then OK.
--
Peter.
The gods will stay away
whilst religions hold sway