Hi, I am the guy who had the woof problem with the X-Cell 60.

It turns out that what was causing the problem was the rubber "o" ring dampers and adjacent washers in the head. The "o" rings were damaged and one of the washers was cupped.

Thanks everyone, especially you coop for your help.

Denis Egli
237 State Hwy 7
Sidney, N.Y. 13838