I often keep my Tormek with the grinding wheel hung up to dry. Sometimes I get forgetful and try to do a quick touch up with the leather honing wheel. Of course, the shaft slides and I have to push the shaft back into position. This causes no damage, except to my ego. The logical fix is to place the plastic spacer which originally came with the Tormek. If that is misplaced, a short piece of plastic pipe approximately 6mm less than the width of the grinding wheel is a convenient stand in.
This also works well when transporting the Tormek.
Ken