Ronix don't juse metal in there bodem plates, i have the cell 2010 and the one 2011 and don't have the problem, the plate where the screw is attached, the teeds are plastic by me and the bolt holder to. Get to your local shop and ask for warranty or by new bolts.
(I undersood it are the bolt keepers, english is not verry good)
http://www.ronixstore.com/products/p...31.0.0.0?pp=8&