I assume somewhere amongst those springs, rods, and foot pedal, there is some sort of slip ring or throw out bearing. I’ll have a look around and see if I can find an exploded diagram. I really haven’t given it any thought, but some sort of threaded adjuster might work. I’m pretty sure the rigid hone setup would be relatively simple. The Sunnen stuff is likely more aggravation than what it’s worth. Probably why you bought the machine.
This will help clear up the doodad in the photo. It’s an ATM (axial throb magnetometer) used for breaking taps. It fits in.. usually a drill press and is used for driving taps. Pull down on the drill press quill ( handle) and the tap threads the hole. Pull up on the quill and the tap reverses out of the hole. Odd and unusual tool for odd and unusual folk who own way too many jets. There are a few whoppers in that rack.
This will help clear up the doodad in the photo. It’s an ATM (axial throb magnetometer) used for breaking taps. It fits in.. usually a drill press and is used for driving taps. Pull down on the drill press quill ( handle) and the tap threads the hole. Pull up on the quill and the tap reverses out of the hole. Odd and unusual tool for odd and unusual folk who own way too many jets. There are a few whoppers in that rack.