I push the clutch in and move my PTO lever to run and slowly release clutch and pto spins up. However when I finish mowing the lever is returned to stop with clutch in and on clutch release the pto starts to engage. I can fiddle with it and wiggle it, and eventually can get it to not engage. Then when I put the brake on and try to get off the tractor stops and won't start again unless I hold PTO switch against contact. Anyway to tighten this or adjust this to work properly? Safety issue!