Here is the Thread Injector that my Mother-In-Law gave me. She broke the plastic spoil holder off of it and bought a new machine. I asked her what she was going to do with it and she said "toss it". I asked, she gave and I fashioned up a new spool holder out of a piece of metal rod affixed to the carry handle.
Pic of some test stitches after getting the tension set correctly for $1 bin Wally-World Nylon. :
Free is always the best price and my Wife is mad because I know how to sew and she doesn't ( but I promised to teach her and she still hasn't taken me up on my offer yet )
Dave aka WK2
Cubmaster of Pack 640 - Smyna, TN
Eagle Scout 1992 - Troop 86 Brentwood, TN
Tread Lightly and Leave No Trace