Hello folks. I have what I assume is an old fixture of some kind. I'd just like to know what it is, what it was for and if it's worth trying to get it in the hands of someone who could use it, if it's not too far gone, anyhow. I kind of doubt it is. It may just needsome TLC. No markings what-so-ever on the piece. Micrometer adjustment/gauging of some sort. A little background- my grandfather was a tool and die machinist and hobby gunsmith. I purchased his house after he passed away and found this in the attic of his old shop. I've kept it for a long time, not having the heart to part with it, for more reasons than one. Any way, any insight or history of this neat old piece would be really cool. I tried to identify once before on a different forum about 10 years ago, with no luck. 
