I know this is a long shot, but I’ve just bought a compression tester, but it has ends like in the below pictures. Unfortunately the plugs are buried deep in the Cossie head, so I need some sort of extension to go into the sparkplug hole, and will protrude out of the head so I can attach the compression tester.

I just wanted to know if there is some sort of standard tubular extension available, before I rush off to my local machine shop to make one up.

Thanks
John