Hi Roger
After reading your post, I ordered the roller from Axminster. I was disapointed at first because the knob would not turn to lift the router - Ryobi 1150. It turned freely with no weight on it, but not under the router, I had to grip it with a pipe wrench which chewed it up. Solution! I took off the knob and used an allen key, I had to use a lever with a hole in it to turn the allen key but it worked, then a new idea, I found that a small socket set of mine had a socket to fit the allen key and using a straight key without the bend was fine with the socket and ratchet driving it.
How did you get on with yours? interested to know
Guyos