1 is stripped...and plainly marked as such...could be tapped for larger tensioner.....$15 "as is"...
1 has some stains on it I could NOT get out...
this one is unusual in that the hole inside is perfectly round....every one I recall has a 1/2" flat spot for the long downstem to lock onto it...Prototype?..$15 also..
last one is the nicest looking...still a few light/med scratches though...$20 plus ship...