I think the only attachment I've tried on my treadle was the ruffler. I really like the attachments, but mainly just to play with them. I have tried the underbraider on my 1898 27 with Persian decals. The only soutache that I could find at the time I wanted to try it was the metallic and that didn't work very well with the underbraider. I tried another underbraider on a 15-clone hand crank some time back with regular soutache and that was fun.
Janey - Neat people never make the exciting discoveries I do.