Original Tappet Screw needed

[Yonder]

Hi folks. I am after an original tappet screw (not a new one) in order to set it in a nut and clamped in a vice, and see how much pressure it will take with a 8" Snap-on wrench. (please see my current thread Tight Tappet...read "Stuck" Tappet in the Tech section) in order to avoid having my #4 exhaust tappet (too small a gap) break off in the engine.I'd be grateful if someone has an original one they could part with.I'm in the UK, and can do paypal.Thanks. Richard