My wife sled has a bit of a issue when we first take it out. We don't ride it much and it only has 1000 miles on it. The primary seems to hang when we first run he sled, real pain when I am loading it. After we run it a while it works fine. I took it apart and it all looks good however the orings are quite hard and the wieghts don't move real freely. Is this normal for these models?