RE: HK Small Bolt Hydro same as HOTR
^^ I don't have any binding with mine at all, the drive line spins over super smooth and easy as it sits. There is a bit of a gap on mine, I found that stock the stub was binding in the strut. I had to move the drive dog towards the threads a bit and put it all together.
Keep in mind it has the stock two piece flex/stub nonsense, so it doesn't pull the prop closer when the flex winds up. Once I get my hands on some parts I'll be making a wire drive for it though.