I purchased my Maximat 7 new about 50 years ago. I only had to make two repairs. I replace one selector shift fork lever. I also had to replace the lead screw nut. The adjusting screw tab on the nut broke. Could not find a replacement. I made a replacement nut from bronze on the lathe. This is a left hand 5/16 x 20 thread. A challenge but interesting part to make.