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Crystal Flavolian
What do mean by shaving the stoppers? What does it do? What's the benefit of it?
The rubber stopper is there to prevent you from accidentally turning off the pedal when you push it to its max treble position. When you hit the stopper the wah is still on, but when you push it past the stop point and compress the stopper, the switch engages or disengages. It can especially be a prob if you have the pedal on carpet because the carpet may compress instead of the rubber.
By shaving down the stopper you reduce the amount of pressure needed to compress it enough to flip the switch. The switch itself, however, can be raised to achieve the same thing. The barrel of the switch that goes through the round hole where it is mounted is threaded, and it will have a pair of nuts or knurled rings to hold it in place. Loosening the bottom one and tightening the top one will raise the switch and make it engage sooner/easier.