I have a Logan 6500 (?) I picked up for use in my shop at home. Seems to work well, except when I engage the high speed by sliding the notched wheel into the main shaft of the gear box, after I use it for a short while, the engagment mechanism becomes disengaged. No big deal, just is a nusiance. Have to shut it down, and re-engage the notched parts. Anyone else have the problem of the locking mechanism becoming disengaged in high range? (not the lever on the front of the lathe that moves back and forth, but the part on the collet closer that locks the 2 parts together)