MICA Insulators?

Radio Shack:

276-1373 Mounting kit, TO-220 style includes mica insulator

276-1371 Mounting kit, TO-3 style includes mica insulator

276-1372 Silicone heat sink grease
 
Funny, when I searched for "mica" on the RS web site I got no hits.
 
Bob Roberts sells them too. I think they are pretty cheap. I bought a bunch with an order one time just to have them on hand.....I think they are a $1 or 2 for a dozen.....
 
Don't for get the Silicone heat sink grease that Ken mentioned. I have had transistor overheat witout it.
 
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