I had a similar thing as a previous poster when the coupler on my 54 inch mower deck to my BX PTO came free. In my case it was the coupler itself that got damaged when it spun loose. The three bearings were dislodge and essentially the couple is wrecked. The dealer say the coupler will cost $200 to replace. Sounds pretty steep for the looks of the part. Has anyone else had a similar problem? Does that sound reasonable? Is there an "online" source for these things at a better price? Thanks! Bill