Well, if it is well used, you could put a big long length of rope on it, and use it to anchor your boat. OR, use it as a weight on each corner of your tent to prevent the tent from blowing away in the wind.
I have a pile of well-used MT-1029 mounts, hauled them back and forth to Aberdeens, couldn't even sell them for $1 ea. I eventually donated them to the Aberdeen auction, and the guys collecting the auction items didn't look that happy to get them.
They are VERY common, unless it's nice shape, it ain't worth that much.