The sac for this converter is supposedly a 17 necked taper. I don't have this particular sac on hand but since it is a personal pen I test fit a normal 17 straight sac. This was too big and barely went in deep enough to go just beyond the opening for the pressure bar. It turns out a 15 straight is the one that fits best. Does the 17 necked taper sac taper down to 15 or is the information stating the proper sac is a 17 necked taper incorrect?
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