Anyone know much about old power tools? Specifically, an older Craftsman radial arm saw. It used to work well, but now the motor won't start or run. It's a capacitor-start motor, and there IS power coming into the J-box where the capacitor is. I suspect that the cap is dead. Is there an easy way to check this theory, or should I just try to track down the appropriate cap, replace it, and see what happens?