well 2HB should work...but man let me tell you, I'm having a hell of a time...almost on 3 hours so far and the best I've gotten is 450 ohm...the mechanical pencil I was using worked great, got me down to 250 ohm in no time...however the pencil mod didn't seem to be working for me. Possibly because there was more lead dust form the mechanical pencil spreading to different components around the resistor. I found the 2HB pencil must more forgiving, much easier and cleaner to use, however I'm not having much success with it.




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