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Original Message
RE: Arrgghhh! I think I know what that is,...
Posted by Lew on December 1, 2015 at 11:08:45:
I think by now you've discovered that I was wrong in the first instance. What I see there is probably the top of the threaded insert for the footer. Viewed from above, as in the photo you posted, it appears to be a free washer, because it is bare metal and washer-shaped.