geoffh
I've wondered about that myself as well as recommendations from some about backing off the plug from snug, I'd think that would cause the threads to stretch prematurely as well.
I do agree... I have been indicationg this for years.... when you work around machinery and your work with metals under stress - Loose creates problems with the build up and then the release of pressure - each time it creates movement - repeated movement creates heat and metal fatique - metal fatique creates ????