I recently had a L.C. A1 in the shop with an interesting accessory. Behind the top tang inletted into the wood is device with a rotating tab. One end is longer than the other so in one position it blocks the far rear position of the safety button. It appears to be nicely crafted and not something ground out scrap by some Bubba.

Any one have any knowledge or info about this thing?
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Sorry for the Cell phone photos