1. It is my understanding the tool can be purchased from the supplier of the switches.
2. The switch comes with the LED light. The incandescent lights that burn out are not replaceable.
3. Not sure about the cutoff of terminals. I would think you should find the exact terminal configure for replacement. If in doubt, call them to verify.
4. I've never checked this. I will though next time we move.
Burq57 you have anything to add?
Also, check Amazon for the switches. I found one(haven't checked for others yet).
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