My Tibaldi Iride's filling mechanism also failed. I knew of no one in the U.S. who could repair it, so four years ago I contacted Francis Goosens in Belgium and he did a superb repair. Francis is also known as Fountainbel in the pen world. Here's a bit about him on the Conid Bulkfiller website:
https://www.conidpen.com/about-conid/who-we-are/francis/
I did not know of Maurizio Abrami, but my interactions with Francis were as pleasant, professional, quick, and reasonable as Art describes for Maurizio. So, this is just another option for you.
If you need further contact info for him, let me know and I will dig in my files for his e-mail.
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