Glad that my Daughter got me one of those quick change cutter's. Since getting it, I have had less problems!

Oh, you stole my comment. Took me a while to figure out the problem.

I think we've all been there. Now if in doubt, I take a picture with my camera or phone on the step by step take apart process, then reverse the scenes to put it back together. It works great when working on old sewing machines.

i've put two blades in too. doesn't work well.