Watchmaker's turn
Watchmaker's drilling turn. The turn has a lug at its base for fitting it into the jaws of a vice. One end of the fork is drilled and tapped to recieve the adjustable back centre and the other end has a plain hole through it. The spindle has a shouldered fore end fitting the hole, whilst the back centre holds the shoulder up against the bearing. The nose of the spindle is bored for the drills. It...