Introduction
This is how to fix the switch when it won't turn on.
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If you have this item and the turn switch resists turning on, this is because there is too much friction where the trun switch rubs the safety control micro-switch. You need to detach all the fittings to be left with the base, then remove the 11 screws (all the same size) keep them safe.
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Once you have separated the two havles, you will be able to see that the knob on the switch has a cam that, when you turn it, depresses the micro-switch. In this photo the buttom on the micro-switch is read since I have already put red grease on it to reduce the friction.
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Conclusion
To reassemble your device, follow these instructions in reverse order.