I wonder if someone can help me, i have a clarke cwl20rv wood lathe that i picked up secondhand, after giving it a clean and grease and turning a piece of wood i noticed that the lathe is noisy and knocks/grumbly a little and the turned work has grooves in it, i had a mini lathe and never had this problem so i don't think it is me. i suspect that maybe the bearings are on there way out but hope it is something else. does anyone have any ideas?