Aww, thank you very much!

I will wait and see my options, either i do it by myself, or find an authorized trusted service person.

I know one shot that do repair old cameras locally, i found it by a coincidence, but i didn't check what kind of old cameras they can repair, i may take my Mamiya 7II and my Optar 135mm and see if they can fix them both, if not, then i can wait until next year and plan to visit USA again and find a near service center to where i will arrive/stay there, pity i couldn't travel there this year.