Ady has found a problem with the Jaguar clutch release bearings that are able to be bought these days. There’s a design fault with them that means they’re not working correctly on the engine rebuilds. So somehow he’s got to figure out a way of getting around this problem, or trying to find a different design.
Unfortunately, this can be a common problem when parts are re-manufactured for classic cars. They’re often not built to last as well as they originally were or they simply don’t fit right.