voltage divider idea

Denis suggested not simply replacing the damaged battery holder in the Telrad but accessing a continuous external power source. Good idea. There is 12 VDC at the 'scope. I wonder if I made a simple voltage divider, using 3 volts for the Telrad illuminator; then I could use the remaining 9 volts to generate heat inside the Telrad... Alternatively, I could use a LM317 voltage regulator.

I should bounce it off The Sage.