Haven't really had time or money to work on the mower till this week. Been using other peoples mower or just my ride-on. I replaced the flywheel key even though it didn't look damaged. There still seems to be a knocking sort of noise. When I had the top cover/fuel tank off I could move the flywheel 1 - 1.5mm up and down. If I was to record a small video of it while running what would be the best one to upload so you can view it?