Thanks AVB,
You have come through in trumps again.
They must have been a little bent as I reassembled it (without having a good look at it before hand) and when it started I had a grinding noise. If it was not bent before it is certainly bent now. I have reassembled about 6 times and did some adjusting each time, ready for a trial run but won't get back to it until later in the week.
Thanks again
