rub a bit of grease.. not chain oil.. onto the threads and just thread it on by hand. if you have a chain whip i would tighten it down mroe but you will get most of the tightening down once you get riding and get in a good climb or hold the brake and torque it down. Im not sure i've seen any freewheels with plastic? but the smooth side goes towards the hub and the side with the indents for the tool go on the outside..or else you'll never be able to pull the thing off.