Since you used the condition of "used", and said it worked perfectly,
then the "as is" is a perfectly working unit. You didn't supply a
perfectly working unit, so it wasn't as described.
Here is a site with a pic of a similar cuff, there is another piece that
attaches for target shooting. The pic is halfway down and the article
talks about how it's used.
https://gundigest.com/more/how-to/rifle-shooting-basics-loop-sling
Well, that happens. After a Champagne supper at the casino or at my
Mom's, the next morning I am always afraid to open my Ebay account and
see what's there! LOL. I doubt it's a software issue, more of a hard
drink issue! Perhaps. They shouldn't have ...
