I also have the 8900, had some problems with the thread cutter to begin with. Not the same as yours, but discovered that I was just barely touching the knee lift, not enough to engage lift. When I changed how I was holding my right leg everything started working right. If your dealer can't or won't help I would contact another dealer quick before you warranty runs out. Every feature on the machine should work correctly, as advertised, if not get your $3,000 back!
Last edited by Gramie bj; 01-19-2015 at 06:22 PM.