We had those servicing blocks issued but better still and cheaper was an old magazine filled with resin or wood. Probably not as durable though
One of our Corporals, I think it was John Dxxxxx from the pineapple lands of Qld put up a good suggestion regarding locking shoulders at unit level. We weren't allowed to use any impact method (such as a hammer or drift) to remove or replace locking shoulders due to the danger of internally fracturing the locking shoulder. Because we used to put the old used/removed ones back in the tray to reuse so there was a danger there. Anyway....... Can I assume that the tools shown above are hard brass KtK?
His idea to test for loose L/S's was a small mathematically calculated drop test, similar to the wood/fibre block above but using a holding plate and brass drift. If a 2lb hammer head was dropped down onto the drift and L/S from a set height, and the L/S remained secure, then it was acceptable. If it moved out, even slightly, it was loose. It went up - or down in this case to the REME Inspectorate blokes in Singapore where it was tested at the big base workshop engineering facility - and then back to Bandiana but I don't think he heard any more. But we used it thereafter to test for loose ones. Otherwise there was no true test except '......can you press it out?' by which time you'd gone past the point of any (?) repair. An oil squeeze was not acceptable for various mechanical reasons
Locking shoulders and CHS wasn't a major problem because the breech blocks were numbered to the rifle (unlike the current L85's and 86's which aren't....., heaven knows why I am bound to ask.... but loose locking shoulders were something that you had to keep an eye on because the recoil load made its way through the L/S and directly but radially onto the solid block behind it.
Interesting thread seeing these tools again. Do you have a white handled bayonet with a 3" or so chopped-off blade KtK. We had an old gripless one as a slave for testing flash eliminator alignment, tightness and serviceability