Thanks Vince but I can't actually decipher whatrand how that system works. Can anyone else?
Interesting to see the standardised trigger mech cover with dimples and holes. Made to fit whatever trigger mech you have. The stripping screw threads were always a bit of a problem on the early Mk2 guns so a drawing was produced so you could drill out holes to match the dimple type cover. The trouble was that there were sooooo many slight variations that the drawings/modification just fell into disrepute and everyone reverted to the well used but not officially recognised method of repair. Drill out the threads to o/d and put a nut and bolt through!