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· Distinguished Technician & SOTW Columnist. RIP, Yo
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MikeRoManiak said:
A: I noticed that this post (located at the bottom of the upper joint) once broke off and sometime tried to fix it with crazy glue. Is this a decent way of fixing it? If it were a sax, it would be a fairly easy soldering job... but I can't imagine soldering into hard rubber. Is there some special adhesive/method to fixing a loose post on a clarinet?
Several ways, depending on the exact situation. If the thread no longer grips at all:
- Superglue
- Epoxy, perhaps with a black pigment.
- Fill the area with grenadilla chips and superglue, or a glued or screwed in graft of grenadilla, then drill and tap for the post. Problem is, you screw the post home and its hole (for the rod) no longer lines up with the other post. This has to be overcome some how... Perhaps thread the post into the graft, THEN glue the graft in, or use a new, blank post.

Whatever, there should have been NO obvious evidence of the job being done, if it is done well.

: In the first picture, the part labelled B seems normal. If you look in the second picture, when I push those keys down, they do not align properly with the holes. This can clearly be cause by 2 things: poor alignment OR there's a problem at the part that I labelled B in the second picture. That part rises up when the keys are pushed down, but it's rise is restricted by another piece that connects the upper and lower joints. So I'm a bit confused when it comes to fixing something like this. (My explanation for this problem may be a bit unclear, but I hope you'll understand)
Whatever does not align or function properly, bend it judiciously (with appropriate non-marring tools, which most DIY guys don't have) until it does. Be very careful not to break off the tops of the tone hole chimneys!

: Last but not least, the connection between the lower joint and bell seems to have chipped off. I do not have the part that broke off. Will it affect the sound much if it is just left like that?
No it won't.
I have reconstructed these with black epoxy and pins inside for reinforcement, just like pinning an amalgam into a tooth.
Another approach is to cut off the tenon, bore out the end of the body to accept a glued-in tenon graft, and turn the graft to shape, both inside and out. Special equipment required.
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