Adjusting presser foot pressure
My FW's seams are kind of puckery, and I think maybe I have too much pressure on the presser foot. I really just need to play with it but I was thinking that I haven't really seen posts on adjusting presser foot pressure properly, and it's something I've never really thought much about.
What's a "good" amount of pressure, and how do you test it? Is it just guess-and-check, or is there some sort of general test that can be done to help get it right? (Of course it's going to be different for different needs, but is there a way to test it with the intended fabrics...?)
Do any of you mark your vintage machines somehow when you find the sweet spot? I have changed pressure on my big modern machine a bit, but it has a numbered dial so I can always put it right back to "normal" afterwards.