Originally Posted by k9dancer
Originally Posted by lovelyl
I use them in my Viking - the Viking dealer was able to tell me which "letter", or size to use. I have even used them successfully in my 1914 Singer treadle! Love them, they seem to last forever. I just throw out the empty bobbins.
So do you use a size M on your treadle?
Actually, I use the size L that fits my Viking! My treadle is a Singer 66-1. I also used it on a Singer 115 treadle.