John Walton wrote:

actually, it's keep MY fingers off the cases of some TO-3 transistors -- I
haven't been able to find the plastic "hats" which go on top of these
transistors to prevent inadvertent contact. I've looked at Digikey, Allied,
Newark and Jameco without success. Anyone point me in the correct
direction?.

Look at the Keystone 4632 or 4634 http://www.keyelco.com/ page 95,
unless they have updated their on line catalog recently.

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Michael A. Terrell
Central Florida