Aluminum works well for the filling of holes as a backing plate...is lighter and waaaay cheaper than brass or copper but does heat up quickly so a pail of water handy helps. I have done similar to the holes the Army filled with Bondo. A few patches later and other than a part of the original CFR number missing you can't tell. Looks good Good luck with the restoration.
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M38A1 CDN 53-32490
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