Not very different from bbs01b though...Yes I look at these videos but when it comes to reassemble these two parts, the video is cut and shows next thing! So I Don't know how they do the trick! It was so light to disassemble….im confused.My nylon gear is excellent and the problem is I overheated it in a 5% hill and then comes a rattling...Sure grease on the nylon gear has melted entirely or better was displaced onto the rotor! Not melted because it's teflon!I haven`t had that part in pieces yet, mine is different as it`s HD - there are many YouTube videos on disassembly ,
are you sure the nylon gear is the correct part, did you replace it? What was the problem with your motor?