I'll try to explain briefly: attempting to resurrect a mid-20's mid-tier pen (M. Ratner and Sons). The nib was in very poor shape, and I have another nib I would like to put in, from a Moore pen. Being non-1st-tier, the original nib was (besides being a bit shorter than the Moore) somewhat thin. When I attempt to place the new nib and feed into the section, they won't seat far enough in, and the nib and feed are sticking out too far (not to mention being about 1/8" too long for the cap.
For a moment I thought about lightly taking down the diameter of the feed, but then I thought there might be leaks around the nib. So my question is: does one look for a different feed? Move on to another nib? or is there a modification that can be done to the original feed to accommodate the other nib?