I purchased a beautiful used Waldmann Sterling Silver with a gold nib. The seller thought it was in excellent condition as it appeared to be. The cartridge convertor would attatch, as would a cartridge and it would leak no mater what. I bought it from a respected seller that guaranteed the pen would not leak and so I was able to return it. It was not able to be repaired as Waldmann used some type of injection molded part which could not be fixed which held the nib assembly in the section and the part was not available from them. As the pen could not be made to work properly I had the option of a refund or an exchange. I chose an exchange for a pen I have been very happy with.
I told this story because it highlights the benefit of buying pens from respected sellers who guarantees their pens and that even such a seller can make a mistake and assume that a modern pen (used) which appears near mint can have a crack that is not visible to the eye. I suspect that the pen was not tested because it appeared to be near mint and we just aren't used to the idea that modern pens fail.
I also purchased a beautiful used (America the Beautiful Model actually) Bexley Fountain Pen at the Ohio Pen Show. The pen appeared to be near mint. I thought, what can go wrong with a ten year old, gently used Bexley Cartridge Convertor and did not try to fill it until after the show. It would not fill. The convertor was stuck to the back of the nib assembly. After much soaking and getting a certain color of blue ink it still was blocked. Eventually I was able to get it all disassembled and found the nib assembly was blocked and sort of melted. The solution was getting a new nib assembly and switching out the nib.
I mention this story because, again there was no visible damage. Does this mean that we may need to start asking to see if almost new pens will fill (with water) using their convertors, and not leak, maybe, because it appears that modern pens may not be any more robust than vintage ones and may requir parts which may or may not be available. I was fortunate with the Bexley as there still are nib units available, but they may not be in the future given the changes with Bexley and some pens are not built using a simple section as the Bexley was that allow for a new nib unit to be screwed in as a replacement and have instead parts unique to not only a manufacturer, but to a specific model as was the Waldmann.
Edited by Parker51, 25 June 2020 - 20:58.