how to repair my wm 52 first edition hotpoint machine?

Hi, My machine will not complete any selected cycle. I can hear the pump trying to drain the water and the drum appears to be empty but the spin cycle does not start. I thought the drainage system could be clogged sure enough the exit hose was full of powder residue and needed to be cleaned i also rfemoved a few coins from the catch. I put the machine back together and for a few weeks it worked perfectly. I put some washing in today and the cycle didnt complete I checked the same as before everything seems to be fine. Anyone got any ideas?

Paul many thanks
October 2009