Kathy, I thought I saw a youtube about how to put it back together and how to get it like it was.
Do you have the TFSR manuals? If you don't, I would suggest downloading all the manuals at
http://web.archive.org/web/201610160...achine_manual/ The one you want for this particular issue should be addressed in "The tension mechanism" on pages 12 and 13.
The manual at
http://ismacs.net/singer_sewing_mach...ine-manual.pdf also talks about disassembling and reassembling the thread tension starting on page 13 of the pdf'
Janey - Neat people never make the exciting discoveries I do.