Hello I have a Kearney and Trecker mill. The handle that adjusts my upper guides for the arbor mount is free wheeling and I believe the pin has sheered off. The handle itself (red circle on picture) which moves the upper guides is attached to a gear assembly, but I'm not sure how it disassembles? Looking for advice for disassembly of the components so I can repair and continue using my machine. Any advice would be appreciated. Thanks.