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I'm with onimaru, not sure it will work.
Wouldn't there be a possibility that the film just gets torn off?

Yesterday I "cut" a piece off a DMT, not with shears but I scraped a line in the backing...

Just don't go fetch your wife's sewing scissors, I cut up some DMT shims with one and it's not quite like before.
Go buy the cheapest metal one you can find.

And if you happen to be within the EU; ATOMA Diamantschleifsteine