I'm no expert, but the ZR40 should react pretty much how you describe wanting it with most drills. I'd probably sugges something like 4.5 x 4 ors something similar. Probably place the pin above the fingers.
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Kyle: Chef, we need Butters to gain about 50 pounds, fast.
Chef: Well, if you want him to get really fat as fast as possible, one of you will have to marry him.
Stan: Marry him?
Chef: It definitely worked for every woman I've ever met.