Hi got a Hoover HNC175-80 Condenser Dryer with a dry squeel noise, gets worse when warmed up. Its Probably the 2 Drum Wheels at the front. Allready greased rear bearing. Can Anything else cause this, ie do they have seperate Jockey Pulleys for the Belt ? What parts needed to rectify ? how do you get at parts to replace ? Anyone got a parts Diagram ? Many Thanks