A Karcher FP222 Scrubbing/Polishing Machine needs repair (Wealdstone HA3)

Hi I was given this Karcher FP222 to investigate for repair and the motor turns just fine but the mechanical drive needs some repair and I just don't have the parts to do this. It is driven by a belt (loose and could do with a new one) from the motor and a central rubber drive roller (which could do with replacing) which turns the scrubbing heads. If you would like it to tinker with or have the parts then this would be a very good three head scrubbing/polishing machine. I have the scrubbing and polishing heads for the machine which are not shown in the photos so if you can fix it, it will be ready to go.