Well the local truck camper dealer was of no help. Gave them all the info thinking they might have a better "in" than I. Not even a call back on it.
So, I did as suggested and sent an email straight to Atwood. Their response, "That thing is full of ball bearings and you don't want to take it apart", but we will sell you a new one for $360 plus shipping. Well yes, I kind of do want to take it apart and I know what a ball screw is!
So, I went at it again and found that what looked like a knurled shaft above the vertical gear is actually and nut! A very thin nut with loctite holding it in place. With that removed, the whole assembly comes apart. Mine was a little rusty. Unfortunately it is more in the recirculating ball part. Cleaning and oiling helped a little. It works but not great.
I'll keep my eyes open for a replacement but am not going to spend that kind of money on it. Other places online want $425 for 2 of them. That's great but I really don't need 2!!
2005 Winnebago Voyage 35A W22