I’ve been having problems with adjusting the foot pressure on my Jones 125 machine. I’ve not seen one like it before and couldn’t work out how to use it. Today I’ve had 3 broken needles and I traced this to the really strong pressure on the foot. My Bernina 1030 doesn’t have this adjustment so it’s not something I work with much.
Then I lucked upon this webpage https://aspenleitervacuum.com/under-pressure-the-adjustment-you-didnt-know-you-had/
Before reading this I’d been twiddling it, popping it up, trying to unscrew it and seeing no difference. After reading this helpful page, it seems the Jones has a ‘pop darner’ style pressure adjuster. The central core pops up when you push down the outer ring, and then you depress the central core in increments to achieve the pressure you want. I imagine the name comes from popping it up to take pressure off when darning (or free embroidering) on the machine. Suddenly it all makes sense. The 3/4 position is so much better for what I am sewing today than all the way down, where it was because I couldn’t work out how to adjust it.
Probably common sense to others, bit not to me!
Thank you to the kind person who took the time to write about the different methods of adjusting foot pressure, and for such a clear explanation.