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Dave years ago I modified two A size pin vises by turning part of the knurl off each. They were held the four jaw chuck and indicated near where the Starrett logo is roll stamped. The attached picture shows a stock B size pin vise and one of my modified A size pin vises. You can see where I removed the knurl. This area was turned to .250 so that the pin vise can be held in a collet when in use. The joke of it all is that I found out later that Starrett does offer pin vises that are not knurled in the same area. If you have any other questions feel free to ask.-Bob