pdiggs, not a tiny line, keep grinding on that resistor with a 2B, or just move the pencil a bit with a 4B, you should get good results.

I tried it with a 2B, but had to keep grinding a lot just to get to 1.4v, and if you grind too much and find a lot of small particles everywhere, you have to blow it away to get constant voltage, or it will fluctuate.