I have a bunch of vintage-ish pens that aren't really worth the few dollars it would take to sac them, has anyone had luck adapting sac-less sac fillers to fit a c/c? Worst case I would consider gluing the converter on the back, effectively turning it into a piston. I am really not a fan of sacs, but I still want to use these pens and they can't eyedropper convert because of the lever and pressure bar. Anyone have any ideas/successes?