Gday Brian,
You could get some u shaped Alum channel, but you would still have to screw it on. Or you could use small angle for the frame, either with tabs welded to it to hold the glass in or weld some angle to the back of a frame to form the U channel. Pad the glass with foam, felt, rubber or some such.
Hope this helps.
Rusty_iron,
Brisbane, Oz.
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