MrRick .... is the reason I made a locking groove to hold the dowel while making a pull cut.
Call me thick, but never late for drinks, I couldn't follow how the "auto" lock worked... though with a good dozuki, the cut could be affected with just the initial push through. Anyway, that was my excuse for butting in with my thoughts.
If your first cut is too short... Take the second cut from the longer end... LBD