I recently came across a Linden lever fill FP and I am not sure whether it is classified as 3rd tier or not. I was wondering if anyone has heard of this pen manufacturer and whether or not I can get parts for the pen. It came in a set with a mechanical pencil, which is is prestine condition. The pen is in great condition on the outside although it is missing the inner cap, the nib, and the jbar. I know that I can get a j bar and a nib, but does anyone have any ideas on the inner cap. will others fit or does it have to be specific? Thanks guys.