Very Basic...


A good chassis is an empty 35 MM film container...easy to poke a couple of holes in to mount the sw and exit the leads.

Only trick is read the instructions on the LED b/c they are polarity sensitive..if it does not work, you most likely have the LED leads reversed...common mistake.
When the tool is assembled, an easy verification test is to simply put the red + and black- across a car battery and press the switch...if the led lights , you are good to go. If No, yoo are reversed on Led lead/ wiring.......

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A Dalton