I needed a second panorama head and wanted to save money on the Manfrotto 300N that I already have. Unfortunately it was a bad choice, at least for me. Sunway's degree adjustment mechanism is similar to Manfrotto's, but when I tightened the adjustment pin (tighten fully, which I think should be, since the pin has a built-in stopper, and that's how Manfrotto works) I actually ended up with the drum's coating scratched, and in the process my 20 degree stop became so rough it was practically…