Choke thermostat problem

slantsixdan said
Yes. loosening the adjustment nut allows you to increase or decrease the spring pressure on the choke rod. There is a long central index mark, and shorter marks on both side of it. "2 notches rich" means the pointer on the movable part of the spring assembly should be aligned with the second short mark in the direction of more spring pressure.

Hi Dan
Effectively, there is a long central index and shorter marks on both side of it, between L and R for Lean and Rich.
But I don't see any pointer on the spring assembly.
It's blank
How may I adjust it?

This thermostat is not junk, it's manufactured by Carter :)