Just purchased a 33/61 PP. I have a vibration in the mower deck. It is very noticable at 1/4 and 1/2 throttle. At full throttle, it's not as bad, but there is alot of play in the belts while running. I thought the blade(s) were bent from the shipper not using long forks when loading the palet onto the trailer. After inspecting the blades, I can not see any damage. Is it possible the blades were slightly bent, like 2mm, and causing the vibration?