Singer 201-2 inconsistent stitches
While test driving a 1952 Singer 201-2 I noticed when I played with the stitch length and went to the smaller and the larger end of the stitch spectrum the threads did not seem locked, guessing bobbin tension was off?? I am not familiar with the horizontal bobbin and the seller did not have a manual to refer to.
When sewing in the 10 stitch range the top and bottom stitch looked great.
I am hoping this is easily remedied but where to start??
TIA for any feedback!
Jo A.
Decals and shellac look great, many accessories, in a cabinet that is in okay-good condition.