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Re: Bad fitting?
if you take the switch out and the groove in the piston is not seen, like it has travelled so far one way you can't see it anymore, you may have to make it move the other way by opening a front bleeder screw (or crack a front brake line at the valve while watching the differential valve piston) and apply the brakes a bit (a buddy helping) so the system senses a pressure differential the other way and the piston moves enough so you can see the groove again. otherwise remove the prop valve section from the rear of the valve and push the piston forward from there using a nice clean tool. the problem with that is you allow air into the system and will have to bleed it again (with the switch tool installed once the valve is centered).
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