Introduction
This will repair a non functioning shoulder switch by dismantling and cleaning.
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Remove the base of the unit and switch activating button as detailed in many other guides.
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Clean the contacts visible inside the casing by scraping gently with the screwdriver. Now clean the concave side of the dished disc with fine wet and dry paper. Replace the disc back into the casing. The concave side should face toward the contacts in the switch, and close the switch back up by gently squeezing with a pair of small pliers.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.