[Arran]

I think that I would have probably used a set of small, pan head, machine screws, such as #8s, along with flat washers, and nuts, just in case I had to remove the dial scale again, such as to clean the back side, although it is easy enough to drill aluminum pop rivets out if you need to. With regard to the numbers and lettering on the scale being raised I don't really see this as an issue as the 1934-35 G.E and RCA sets had this, and unlike this 1936 model they don't wash away, at least on the Canadian versions.
Regards
Arran