The Tester Approves thread (see first post)

beer can, right?

Depends on the beer. Modern aluminum cans are about half the thickness required. If you can be arsed to cut two shims, then yes, go for it, at least as a temporary measure. I'd go with brass as an optimal choice between an aluminium clamp and a carbon frame, although it seems hard to get 8thou in small quantities at the moment.