Do you have the concave extention onIJ We don't split ours and they come out ok, also try to set your wheels out abit if possible, more room helps a lot. The grates are a bit of a pain, with more bolts. I would think I can swap everything on our 1680 in just over an hour on my own. I can do 3 concaves in 20 minutes. Well oiled bolts help alot too!!