I take this 5W resistor: Stackpole CB5JB20R0. I put it in the vice with the points on each side clamped and squeeze it. The outer ceramic shell flakes away and I have a perfect 2W 20 ohm resistor for the smoke unit. In quantity 10, they're 38 cents each. I use these as I want the uncoated resistors, and they're hard to find.
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