LAD. = Light Aid Detachment. Smallish RAEME workshop attached to the main units. I know all about the effects of back-loading everything to the manufacturers. It leads to skill starvation......... Don't get me going. Anyway, have a good one!

From what you describe, the gravograph is virtually a modern Taylor Hobson engraver! I was a dab hand at the engraving machine. I looked on that auction site to see if I could find one. The big taylor hobsons were quite cheap, plenty of spares (still supplied) but a bit big for my now cramped workshop!