You can't take the wheels off until you're inside - and then you'll probably not want to. There are 5 screws holding the top on, all are "star" type. Undo the visible 1. Pop off the on/off switch & rewind tabs (rewind requires that you 1st remove part of ducting). Then lever wheel away & block (I wedged in screwdriver handle) then undo the 2 scres on each side - use star drive if you have a long enough one, I used regular 'driver of exact right width (checked using extracted visible 1). Good luck.
Gordon Windham, August 2004