This is another that might work for caping. It has a finger stop, and enough handle to hold on to.

I was at a taxidermist shop one day and he was caping out a bear. He had an entire case of single edge razor blades nearby, and he seemed to be doing okay. He wasn't using a holder for the razor blade. That is why I thought thin and sharp would be what you needed.

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Or a scaled down version of this:

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