Need a thread tenson dial for a dress maker 101
If your upper Thread Tension Dial/Assembly is out of whack, broken or missing, then you need to Re-Adjust/Re-Calibrate, Repair or Replace it with a used or new part upper "Thread Tension Assembly". New Exact Replacement Parts are usually not available on vintage machines, so you will need to (a) Buy a used part (Exact or Similar enough to be compatible and work), or
Used parts can usually be found on-line, from used parts dealers or people selling stuff on places like eBay, etsy or Craig's List.
(b) a new generic part that may need to be mounted, but may loose the ability to automatically release thread tension when the presser-foot is lifted. New generic parts are not likely for this part, so unless you can figure out how to rebuild and fix the one you have, your last option may be to bolt-on an independent industrial, "Thread Tension Assembly", that can be bought on-line from Cleaner's Supply catalog < cleanersupply.com > for the price of a cheap dinner. Hope this helps.
Sincerely, --Amender (2018 FEB 19)
7 hours ago