I have a 1hp Sta-Rite Max-e-pro motor and I'm replacing it. I need to remove the impeller but it has no lock screw. I assume you just unscrew it by hand but it wont budge. I have a wrench on the opposite side of the motor shaft flats. I've tried strap wrenches but still no luck. Going off of the replacement motor I am assuming it is a normally threaded shaft (righty tight) vs the reverse threaded (lefty tight) ones I have read about on other pumps Any advice? Just get a new impeller and don't worry about damaging it getting it off?