On Nov 10, 12:28*pm, Tom wrote:
Black & Decker miter sale model 7715 type 3.

I bought this saw at a garage sale. the seller cut a board, said it
needs a blade. But, I can't remove the old blade. The armature of the
motor turns when I try to turn the *blade nut. If I "jam" the blade so
it can't turn, the armature still turns. How do I lock the motor to
remove the blade?


If there is enough space between the nut and the end of the shaft
drill a small hole through the shaft end so you can get a awl or other
rod in place to hold the shaft still while loosing the nut.