how do i secure it to the controller? i took otu the old one and attached the new shaft to the new wheel. i just dunno how to secure the new wheel with shaft and the locking plate on to the controller. i mean, i put a screw in at the end of the shaft like the diagram shows but it doesnt do anything, i can pull the wheel out easily and the locking plate just comes off since it isnt secured on to the controller. anyone knwo what i'm doing wrong?