Anyone tried the "hemmer" foot for their thread injector? I got a 1/4" hemmer foot for my Singer 301 and tried it out on some ripstop and polyester. Once I got the handle on the technique, it made a beautiful rolled hem that looks like it came from a factory. Just curious why I haven't seen anything on HF about this little gadget. It only cost about $14.00, new, and they are made for almost any injector. Your input would be appreciated.