I recently substituted a Kipp adjustable clamping lever to the carriage lock replacing the original Allen head screw so that I would not have to have a loose Allen wrench lying about on the carriage. If anyone is interested the Kipp part no. for the handle is 06610-20886x50 (M8- 1.25x50 mm stud length) I had to build a spacer to go under the head of the handle (spacer dimensions are 1/2" OD, 21/64" bore, .200" thick), my spacer is made from brass but steel or aluminum would work just as well. I would rather have had an all metal handle rather than the plastic, but this was my first experience in purchasing a Kipp adjustable handle. I copied another member's idea from here on the forum for this, but I can't remember who it was, wish that I could give him his due credit for the idea.