Just what are these ?

[ferretjuggler]

I've seen loads of these for sale on eBay etc, masquerading as an A50/A65 primary chain tensioner.
I know very well what the genuine BSA part looks like, I'd just like to know what the interloper is actually from ?
Looks like an automotive cam chain tensioner to me.
Will it actually work in an A65  properly ?

[CheeserBeezer]

Aftermarket part made by Wassell, I think.

[ferretjuggler]

Thanks for that.
So presumably they will fit and work without mashing your primary chain or whatever ?