Hi all, Another queries I need an answer for please, I need to change my chain and sprockets on my glee, having taken the plastic cover off by the front sprocket I noticed there is a "ring type thing" that I think the sensor rubs on! Which is in front of the sprocket nut, is it just pushed on? As I have tried to get it off with a puller but it seems very tight and I don't want to break it! Also could you please tell me what size socket fits the nut? Thanks everyone, cheers Tone.