to pull out a gear, cam, head from a motor we can make pullers easily.. need an appropriate SS nut and bolt, then make a square "U" from appropritae metal, then drill a hole over the U, and can fix the nut, then bolt, yes must turn out the tip of the bolt, to the needed length, then can cut a metal washer in to two, then weld at the tips.. a hinge at the top of the U helps to use same puller in various sizes.. and if you have a hand arbor, need not any puller but only a base.. hacksaw a tiny ridge to an appropriate waser, then can place over tip mandrell, then insert the motor as gear faces up, then use a second rod to push out the original motor shaft.. cool..