3. fsrmg1
With the MCA, when you subscribe then you're able to run an Wanted ad in their newsletter, reaching people that way. A slow process, but one never knows.

With Tom, I'd suggest giving him a phone call. Keep calling until you reach him!

As most folks involved with Mannlicher Schoenauer rifles/carbines, especially pre-1972 and pre-WWII, are aware of, spare parts merely laying around are a rarity! I've worked gun shows since 1969 and M-S parts are extremely difficult to find. In all these years would say I've only found 2-3 good quality parts (this does not include after market scope bases or receiver sights - which are tough enough to find also). From 1977 through today, at one time I had 18 M-S rifles and carbines, but really no extra parts. Just so difficult to find...

Finding a M-S that has been destroyed/damaged enough, where the owner parts out the M-S is seldom encountered, but is one of the very few ways to find a part(s). Bird dog determination is what it takes. Hang in there...

Maybe list parts you're looking for in some of the firearms auction sites in the Wanted Items section? Might as well fire shots in all directions, might just hit something that way? I wish you well...
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1. The forearm takedown pin, though not exact, a suitable/functional one can be made, until finding an original one.
2. Escutcheon plates should be easy enough to make.
3. Bent butt plate trapdoor: quickest way would be do some major repair work to try and bring it back to original shape. Not an easy accomplishment, seeing how they're cast.

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best of luck in your searching...