Just replaced tbe bearings on my upper wheel with bearings bought from Amazon. 1 hr and no problems.I've had my G0555 for about 13 years and I like it. I'd like a new one. I put the riser block on a couple of years after I got it. I've got a bad squeaky bearing, I think on the large blade wheel, but I'm still trying to talk myself into fixing it. Life gets in the way!!
Tom