Welcome.
Great that you have it sewing
and the manual.
Have you tried "Miracle Stitch"? I'd like to see a picture of that.
Have you seen -
White Sewmaster
Cleaning a 611 white rotary
White 611 Sewmaster RotarySewing Machine
Some are older and original posters have not been active for a while.
Janey - Neat people never make the exciting discoveries I do.