General advice/info on presser foot shaft tension on vintage machines?
Hi Group,
This is a question in general pertaining to the knurled knob which lives at the top of the presser foot shaft, on top of the machine. My question is not specific to any model; it is a general one.
As I understand it, one adjusts this knurled know in order to increase or decrease the tension on the spring which houses the presser foot shaft, and therefore adjusts the degree of pressure that the presser foot is exerting on the fabric.
I am still quite new to sewing, so I would like to ask you more seasoned folk here to give me a mini-lesson here! In reality, do you find that you adjust this knob from project to project? What sort of method do you use to determine the correct amount of pressure? (putting test fabric, lowering feed dogs, and then tugging fabric? What sort of resistance would you aim for?)
Many thanks for -any- input you have. I am many things* but an experienced sewist is not one of them. Chances are that anything you tell me will be news to me, and helpful.
Thank you in advance.
* Coffee-sipper, machine-tinkerer, sewing machine classified-ad ogler... ;-)