Thanks for the offer of the spacer. Apparently, and according to Emporium Hi-Fi the white spacer for the Anni is not as deep as those for other Pinks, so if Tim would like it he can have it. Also, Emporium have the spacer for these as a stock item. I have been informed by them that they definitely will be able to get the Armboard/Spacer for me, but it's a special order so will take a minimum of 2 weeks. Regarding the motor issue I have managed to cut up an old Pink belt and place a couple of folded up pieces underneath the wooden 'thingy' that surrounds the motor, which have straightened the motor pully.
I would still be interested to find out from Anni owners how to take the sub-chassis out (without trashing it) so that I can perform a more permanent fix?