Wiring re-connection problem and belt re-tensioning, zanussi tc470?

I took my tumble drier to bits as it had stopped heating and found that the water level in a box like thing had risen and a float had tripped a switch. Putting it all back together with my Dad's help, me being a weak and feeble female!, I am having problems with 2 things First I pulled off the plug connectors from the inside of the mains input lead so I could remove the back panel and now not sure what order they go back. THere is the brown, blue and earth leads but also a lead with a clear plastic covering and also 2 black leads which go to a small cylinder just inside the machine. Can anybody tell me in what order these go back?
Also I can't get the tension back on the belt, I tried 2 alternatives for the belt to go round the motor arm ant the other plastic drive wheel but it is not as tight as it was before I took it to pieces. (my dad is useless!)

June