Rubber Rests. Wooden Rests. Mk1 and Mk1*

[Lynn Eades]

We need a place to store details about the various rests and how they are fitted.
Firstly, the rests were steel backed rubber and came in 2 heights.(high and low, or tall and short?) Later they were made of wood (which rubber ones apply to which carriers and when did the wooden ones come into vogue?)
The next issue is, are the steel angle irons they are fitted to, are they on the inside or the outside? It appears the Mortar carriers had the side mounted ones on the outside while the U.C. had them on the inside. (and the U.C. rear ones are on the outside) This would require two different angle irons for the long side one because it is a different length from the mount hole to the end (at each end)
Following on from this, I have picked up on a detail from facebook that the mounting screws are fitted from the bottom up. This I agree with, with regards the ones over the division plate (because my angle iron is countersunk from the bottom))
The evidence that I have for the rest of them, is that a round head machine screw and flat washer are fitted from the top down, with a spring washer and nut on the underside.
Are the side and rear angle irons bolted to the hull plates? (or are they riveted?) I assume they were bolted?
If we can get some solid info added here it will help those following on.