Here is the photo from the old thread on this. Tinypic is closing, so fingers crossed--

Since then, I have broken off most of the 120v element so there would be room for clamping a new one on as suggested above. Not sure I can get the 12v one out, but also it seems to be thinner, so not sure the fatter 120v would fit in the 12v sleeve. I will check that all out when I get the new 120v element.
I don't mind using the shore power to run the converter to supply the 12v element for a day or two before a trip. It is all propane once we head out and go off-grid.