I've always wanted one of the Sheaffer "Dolls" ring top pens and recently found a lime green one similar to this post by FPN user Phthalo whose photo appears below. I was VERY surprised to find that the nibs from Sheaffer No Nonsense Pens were too large in diameter to fit! Upon doing a bit of research it seems that the Guys and Dolls pens were precursors to the No Nonsense. Any idea what other nib units fit these??