Originally Posted By: Rodion
Oh woe is me!

Check out the extra reviews: they say the contact area is too small for the Maglite spring.

Any idea how to fix this?

Lol, that's exactly why I got these converters - D cell maglites.
I suppose some conductive foil on the bottom of the convertor would increase the contact area as long as you were careful not to short on the sides of the tubes.