Hey Blister, its not a secret I followed the instructions of NikNak (see below) and it now purrs, got to admit I've been greasing the shafts but haven't given it a proper cleaning since I bought it. From now on I will take proper care of it.
"I didn't tighten any nut or what ever... i recall i took the pulley/motor shroud off, gave the insides a damn good hoover and clean out. Very lightly lubed the shaft(s) but making sure you get NONE on the pulley or belts..!!! Hit the go button and give the speed lever a swivel and away it went again.... sorted."