70 Cigar Lighter Shell & Clamp

I just picked up a shell and clamp for my 70 'Cuda PN2932727 or so it should be, and after disassembly and cleaning I decided to test it . . . but with the barrel shown at the right of the photo (seems to be an isolator of sorts), I cant seem to get continuity . . . no matter the scenario, lighter in or just jumping from the stud to the retainer inside the shell.

So I check with a buddy who has several 'Cudas (one since new) and he says his don't have that on the back of the shell. So now I unscrew the thingy on the right, and with the lighter depressed )like I want to light one up, I get continuity.

So what is this thing and who uses it??

another shot

OK, since I posted this thing, heres the answer in the event someone else see's this . . . apparently its a 50-60's Ford resettable breaker for a lighter . . . Poking around e-bay helped me to find this;

http://www.ebay.com/itm/54-55-56-57-58-5...d81&vxp=mtr

http://www.ebay.com/itm/FEW14429A-1952-6...2c9&vxp=mtr

So now my question is changing to questions on the shell and clamp;
Pictures from an original 70 'Cuda as well as dimensions and finish would be appreciated.

Thanks for the help

Anyone ?
Picture of original shell and clamp?
Finish? Phosphate ? Bright zinc?
Couple dimensions?

All the car company's used a fuse like that at one time or another

By the way, that Knurled knob is incorrect, should be smooth on a 1970

Quote:

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By the way, that Knurled knob is incorrect, should be smooth on a 1970

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Others have made similar statements, but believe the knurled knob may have been used in certain models, perhaps different suppliers, considering there is but one PN for knobs in 1970 & 71 (2290188) with cases of both smooth and knurled being found in original owner cars, I'd be cautious to make a definitive statement like "that knurled knob is incorrect." We are talking Mopar after all.

That said, I plan to continue to search for a smooth one in great condition as I believe it was more prevalent, and generally accepted as the norm.