We may have found other answers which could help you.
Click here for Sewing Machine Timing Bottom Thread
Frister Rossman cub 3 - How to take it apart?
Tension wont move on Frister Rossman 972?
spare part for Frister Rossman Beaver4?
Frister Rossman 300 cog broken?
How can I fix the clutch on the hand wheel of a Frister Rossman Cub 3?
where can I get a free manual for my Frister Rossman Cub 4 sewing machine?