A couple questions for our Esterbrook experts...Is anybody selling sac tray replacements for the Esterbrook J fountain pens? Secondly, am I correct in assuming that if no sac tray replacement is available, a #18 sac rather than a #16 is used for sac restoration to compensate for increased barrel width? I've been restoring an occasional Estie here and there over several years and never realized that a sac tray existed until I pulled a piece of translucent plastic out of a J recently. Apparently my reading comprehension sucks...since, in the past, I've read both Paul Hoban and Frank Dubiel books. Thanks for any info you can provide. Mary