If you have access to airtools or electric impact driver should come right off.The drive boss will be between the variater the one on the left.The ramp and roller weights.Once you get the nut off and outer gear try to hold all together so you can see how it works.If you dont parts will fall out of this piece not hard to figure out but best to get a look at it first.The boss is the tube thing between the two,some just have a washer that needs to be removed some need to be replaced with a unrestricted one,if it has a machined lip most likely need to replace or have shaved off.should be smoothe all the way.Hold rear roller ramp together when replacing or the rollers can get turned sideways play with it a little bit youl figure it out.Good luck