Posted by Mike Day on Thursday, October 06, 2005 at 9:28PM :
In Reply to: Why is it always teeth up? posted by Keith in Washington on Wednesday, October 05, 2005 at 3:35PM :
With the cuts up, gravity and a spring keeps the pins down to align on the shear line. Cuts down, only a small spring to keep the pins up to align the shear line. Spring gets weak, key won't turn.