camera panning issues

Bought my H off of eBay. In perfect condition as stated by the seller. It was shipped in the backpack with the box foam. Well packed, very protected. The landing gear does not work properly. One side tries, goes up 10-20 degrees and stops, the other doesn't move at all. I have calibrated the...

When I'm tilting the camera on the Typhoon 4k up and down it always goes past the stop point I had intended. It takes me a number of tries to feather the tilt selector switch to align the shot the way I want. Does anyone know how to keep the camera from sliding past the point you wanted it to...