Hello, I looked at an ad on Craigslist, and they had this lawnmower blade balancer on a table. I looked more closely, and I saw what I thought was a Starrett Vial for a machinist's level. I was the first one there, brought it home , and sure enough , it is a Starrett, ground vial, with rotating cover!!!!! I bought this to swap out the broken vial on a Starrett Machinist Level that I have here. Guess what I can't find??????? We have a What's It Forum, I need a "Where Is It Forum"!!!!!! Regards, Lou