Great review, AL01! What did you ask when you sent it off to Pilot? And how did you contact Pilot Japan? I have only been able to get ahold of Pilot US. I have a couple hard starters that I'd love to use more if they worked better.
I just contacted Pilot of USA and told them of the issue I was having with the pen. I believe Pilot can only give the pen a complementary clean up, (I don't think that includes disassembly and polishing, but I could be wrong).
Because the pen was vintage and was never sold in the USA, Pilot of USA will send the pen to Pilot of Japan. While my memory of the whole event is fuzzier now than it was when I made the review, what I can say is that Pilot Japan tuned the nib for Western writing, (it was waaaaay to smooth and wet), and that the pen came back cleaned inside out, (I know this because the trim ring was initially loose. After repairs, the ring was tight, and the pen looked brand spankin' new!).
I hope that helps, and I KNOW that Pilot will do a good job repairing your pen.
... AND it will cost less than sending it off to the cheapest nib-meister around.