I don;t know about the spheros... but the stradic has a few secrets.. thanks to F18 I know them. When you remove the rotor... the underside is gray plastic with 6 screws... you should only remove the 3 longer ones... remove them... leave the short ones in place, inside that piece is where that exploding spring is. Then when you remove the side plate there are 2 small nuts that are held in place by the plate, when you take it off if you don;t know about them they will fall out and be gone forever.
-Dave
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