Hi, just joined the forum. Trying to help my father-in-law with his mower. Started with a mower that did nothing. Replaced the old battery that wouldn’t hold a charge. No change, no clicking or sounds. Tested relay and solenoid and they needed replacement. Did that. Starter now spins but won’t engage. Took starter off, cleaned/lubricated and still just spins. Considering a new starter but don’t think it’s the issue. What else should I be looking for?