$250. I have an S10C I would like to trade for an S51DT.I do not use the scotch tension attachment and I do not need a folding wheel……I have 3 bobbins for the irish tension and 1 for the scotch tension.This wheel will do EVERYTHING you want to do,and the single treadle is like no other.This is an awesome wheel,I just don’t use it much for scotch tension.