I took the back of the dryer to put oil on spindle at back but a bit has fell off and havent a clue where it goes.Its a round piece with grooves on it i can only assume that it belongs on the drum spindle but dont know if it goes on the inside or the outside part of the drum
Sounds like you need some help 07973 155565 it sounds like your dryer might have a broken bearing on the spindle and it has then worn through the spindle which means major surgery but without seeing it it is hard to say.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix tumble dryers.