Need a help:
Penn make F61-TB-9100 model flow switch has a range adjustment screw at the top near the electrical terminals. The adjustment screw is very small size, kept inside a bronze nut or socket.
How do I adjust the setting? Use a wrench on the bronze nut or a mini-screw driver to turn the small screw inside?
I tried both. The spring below seems to move. But want to do it the right way. Has anyone adjusted the setting for this model flow switch at site? What is the right way to do it?
Thanks for your help!