Whats a good substitution for the good ole yellow gear marking compound. Nobody sells it in town here. I assume prussian blue would work just the same. Someone else mentioined red marine or bearing grease. I've even considered coloring the teeth with a permanent marker (I've done this for gasket matching).

What have you used that works?

 

Permatex prussian blue, get it at napa.

 

white lithium grease

 

i never liked the prussian blue. white lithium in a tub (like wheel bearing greese) works real good

 

Try a white crayon, I stold one from my kids. Worked for me.