"Handsome reproduction shades were everywhere...... None of the patterns were similar to the shade I had broken....My old shade had a deep neck that fitted inside the base without further support. Would the screw shades fit? And would it be a problem if the base of the shade was an 1/8 or 1/4 of an inch bigger (or smaller) than the old one? These questions had answers. And I found them at www.lampglass.nu.......On the homepage I clicked on How to Measure and was miraculously transported to a step-by-step explanation of how to determine what style of shade was right for my base....."