A variety of inserts have been made that will adapt Vicmarc chucks to most lathes. All left hand, left hand/right hand, Geiger, M30x3.5, M33x3.5 and 1 1/4x8 inserts come with a grub screw locking facility for safety to prevent the chuck from unscrewing itself while turning outboard. Note: When mounting insert onto the chuck, ensure that the grub screw is not protruding past the insert face, and then tighten the insert against the chuck face then tightening the grub screw.
Adam (Submitted on Mar 14th 2016)
It is a well machined insert, not much to say but it does its work. The grab screw its a must have when going in reverse.