I do their warranty work. If you purchased the harmonica from a US vendor less than a year ago, I can look at it for the cost of shipping.
And if not, I can still help.
I do other brands too, Hohner has me on their website as a repair guy, but I am the official Warranty Guy for KMC, which acquired the franchise a few years ago.
I have been covering that spot for a dozen years, I used to do it in San Diego at the warehouse, before the franchise got sold.
I am in Oklahoma now.