Quote Originally Posted by laura* View Post
Um, aluminum would work.

I take it that the pump has two stacks of D (or C, or AA) cells inserted in opposite directions - and that the cover bridges between the stacks?

Some possibilities: A screwdriver, a fork, a knife, a key, a SPD cleat, a quarter or other coin.
Cool! Shows you how much I know - though I was thinking of aluminum foil. Yes, your assumption is correct. And only two of the 4 D batteries need contacts, of course.

Thanks for the ideas! I need to pick up some tape tomorrow and start experimenting after my bike ride...