Adjusting R8 to Increase HP-97 Printer Intensity

[James Linder]

I ordered the PCB mount potentiometers. I see they have 3 connectors.
I see 1st or left terminal is to be grounded, middle #2 is input and right # 3 is output to PCB. In the pictures showing R8 which end is the output from R8 that is Input to #2 of the potentiometer? Also, where would the most convenient ground be located for terminal #1 of the potentiometer?I’m just a beginner on circuits and want to make certain that I do not screw up the installation. Do you think increasing resistance is guaranteed to increase print intensity? I bought some 50k ohm potentiometers in addition to the 20K’s just in case I need to add more resistance than 20K to achieve the desired results. Thank you very much for your help!!