frodo

Hello to all of you
I recently acquired my grandmothers 1922 red ball singer. now I am trying to learn to sew.
I have gone through the machine cleaning what i can and oiling it up. it purrs like a kitten.
The problem I am having is operator problems.
I mounted a motor from a brother sewing machine.
[ATTACH=CONFIG]619110[/ATTACH]
So now it is a Brother Singer,
I am sewing, but do not have a clue as to what I am doing. My goal is to make a quilt as some time
so if you guys will take pity on a retired plumber that is trying to learn to sew. I will appreciate it

How do you set the thread tension correctly?
and
below the bobbin winding thingy. is a knob. what is that for?

[ATTACH=CONFIG]619108[/ATTACH]