Reproduction Plastic Keyguard.jpg 28M Eb Alto 348231 (1951)Thumbnails28M Eb Alto 336282 (1950)
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Rather nice reproduction keyguards from DoctorSax.

Do yourself a favor and go to the above linky.
DoctorSax also has pictures of a pretty nifty metal keyguard replacement, the original Conn patent drawings,
and a bunch of other related stuff.

I do wonder if you could 3D print one of these ...