Il Pompino Crank "cap"

Cheeky Posts: 113
edited August 2010 in Road general
Been trying to find a replacement crank "cap" (the but which you screw into the non drive side crank to pull everything together) as mine fell off my Pompino.

On One haven't been much help (it is one of ther own brand cranks) and all they tell me is that its Shimano compatible (which it isn't, and 2 LBSs have also agreed). Short of changing the whole crank set up has anyone had a similar problem or know where I might get a replacement?