Step 1: Strip down
The internet was useful for finding and printing off an exploded diagram, invaluable prior to dismantling the unit.
It proved to be an extremely filthy job so I took care to minimise the muck by carefully disposing of it at each stage. I washed off all the greasy and dusty parts in kerosene as they became free.
Step 2: Clean off
This was still fractionally too big so the motor had to be adjusted. There was not enough drift with the existing set-up so I had to make two of the mounting holes into slots.
Make sure the motor is parallel to the pulley when adjusting the tension during rebuilding.
After rebuild the belt now clears the housing and runs very well. The new belt is toothed but this seems to work ok. The large driven pulley was catching on the housing back plate so I inserted a copper washer behind it to allow for clearance. The motor can be finely adjusted fore and aft to allow for this and make sure that both pulleys are aligned and running parallel.
The new belt was notched but this doesn’t seem to matter to, or affect the mixer’s operation, in subsequent use.