I also picked one up in a basket of impact sockets at a yard sale. Had no idea what it was at the time (must say it looks awfully strange connected to anything but an impact gun, please try it on a ratchet or breaker bar, just for kicks...). I still have little idea what they were intended for...
Cringed when the file was tightened in the vise. Please put something soft between the jaws of the vise and the file. Nothing worse than a dull file. Best case would be to delete this video and do it again, only this time pad the jaws with something/anything soft?
This would be for locating leaks in tires?? Lots of times it would be nice to have a tub meant for that. Usually end up with some soapy water in a cup trying to pour it all over the tire, works...eventually.
Please measure voltage across the two input leads for the contactor. Then measure voltage across the input and output of the contactor (input 1 and output 1, then input 2 and output 2). Leave the clamp holding your contactor closed.