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That’s what I thought. I just tightened mine up by hand in anticipation of having to remove it again soon, and I’ve ordered the TORX screwdriver bits. Thank you, both, for your helpful and timely advice; it’s great to be able to talk to friendly experts, and always a pleasure to learn new skills.

Incidentally, I wonder why the lock-ring should be tightened to 40 Nm. Is it a leftover from the days when all the rings were separate? Mine were all connected apart from the smallest one.

Here’s an update on what I found. After having modified my lock-ring removal tool to accommodate the motor wiring spindle, I eventually managed to undo the lock-ring, with the the help of my much stronger son; it needed an enormous amount of force and then let go with a loud click. It was an...

Thanks. I’ll try the oil trick first. I know it is some sort of Freehub and I already have the replacement cassette sprocket, I just don’t know what sort of freehub I am going to find.

Thank you. The bike has a Bafang motor.

I have a three-year old Carrera Crosscity. Lately I have been experiencing a lack of drive whilst pedalling, i.e. using the chain and when not using the motor. On these occasions I have been able to continue under electric power alone, by merely moving the pedals. I’m assuming therefore that...