I think the proper name for the screw head is Robertson. It appears to be commonly shortened to Roberts. I never heard of Thompson.
If you go into a hardware store like Ace or Home Depot, none of these names will help. You will usually find "square drive" to be the name of choice, and one that the clerks will know.
I'm thinking you want a #2 size. In my toolbox, I have a green one and a red one, standard colors for #1 and #2 (probably bought them as a set). In all the years I've owned a TM, I've never used the green one.
Bill
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