The tiny screws are the same as on the Suzuki M-32C and A34C and aren’t a problem for those versions if you’re careful and have a good 00x50mm screwdriver. The problem is that the melodica is such a tight fit in the M-37C’s metal tray that it’s hard to get the holes lined up so the screw doesn’t go in at an angle and get stuck and mess up threads. It’s possible to buy assortments of tiny screws (for jewelry, computer equipment, etc.) fairly cheaply, if screw heads or threads do get stripped. Amazon.com has some, and hardware and craft or hobby stores might.