Do you still have the broken spring? Have you checked pictures of sewing machine check springs. I know Sew-Classic and Sewing Parts Online carry check springs, as do many others.
A picture may help, besides, we like pictures. The pictures usually need to be reduced to 640x480 or at least less than 1.9MB
I have one machine that the tension assembly was missing lots of parts and I still got it to sew
Pfaff K
I'm not sure where my Elgin 2468 is 'buried'
Janey - Neat people never make the exciting discoveries I do.