1. some people shouldn't be allowed to have tools they can't handle.
2. those are really delicate parts which demand gentleness and respect.
3. when you take a chromatic apart, you need to mark top and bottom reed plates, and which surface of each plate was to the outside.
4. when you take apart the mouthpiece, you need to note which way the slide plate is oriented. otherwise the button will work exactly backwards.
5. if you loose one of the two little plastic or rubber grommets that go round the screws that hold the mouthpiece to the comb, you will eventual saw the screw in half with the slide plate. a particurly disconcerting event if it occurs while playing and the mouthpieces pops off that end of the harmonica.
6. when you mess with that hairpin spring that makes the slide plate return to the out position, you need to be careful. on wooden comb harmonicas that spring can break right through the wood, making the harmonica basically useless without some really skilled and creative repairs.
7. when you allow the bare reed plates to slide around, especially on each other, there is a huge risk of bending/creasing a valve (those little white doohickeys). bend em and they're useless. (they can be replaced by another valve. using a very sharp scraper, remove the valve from the top of the reed. get an undamaged valve and use duco cement to glue it back into place carefully. alignment of the valves is very important or they won't work.)
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