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If the cam on the Thompson A you have still works smoothly and the jaws are even, not pitted or damaged, then don't even think of the Cabela's stuff. Near as I recall and maybe things have changed...

I made a wooden base out of a piece of pine that was about 6 x 8 x 2. It balanced well enough for the trout flies I tyed. May not have balanced as well for 'large' flies. Maybe one made out of oak...