I was recently given a DoAll C4 band saw. The feed does not work. When I lift the machine I can get it to stop, but when I release the break the saw just falls, quickly. I've replace the springs in the back, the shock absorber, and the break cable. I am at my wits end. The feed is supposed to be controlled by adjusting a screw at the bottom of the machine that increases tension on the springs. That isn't working for me. If anyone has any thoughts I would greatly appreciate them. Thanks.