What is it used for?

RustyRatRod said
Did you read the link I posted? Navy stuff. WWII ship engines.

Sorry Rusty, I overlooked it due to my "tunnel vision." :rolleyes:, but I found a video ( A toolroom lathe spindle bearing re-scrape. - YouTube) also showing its use. I knew I would get the answers from the smart folks on this forum. :thumbsup:
Norm