I'm surprised you're having this problem - you can't move it at all? or you can move it but not all the way in?
If the latter it may be obstructed by something at the back?
Never mind...Universal Appliance Rollers may solve your problem at £10.99
Sorry - unable to send brute force.
http://www.espares.co.uk/search/washing-machines/baumatic/p/1085/1533
Good luck...
Peccavi
March 2009