I wouldn't buy a "metric" or "imperial" die set. It might be metric, you buy a metric die set, and the size you need is not even there. I'd measure it exactly and get just the die(s) you need. A clarinet usually doesn't have more than about two thread sizes anyway, sometimes just one. Maybe this one is metric and the next time you need an imperial one?Hi clarnibass
Thanks for your reply
The only reason needing to know whether the screws are metric is so I can buy the right die set.
I would drill out a larger diameter hole, fill the hole with an appropriate diameter brass or nickel rod and solder it into place, clean and once a hole has been drilled in the centre of the new stock, face off the brass level with the post, using files and specialist tools for squareing off hinge rods. if you remove too much material then the key will bee loose between its posts (probably likely in this instance anyhow as its a really old clarinet) you will then need to swedge (stretch) the key hinge to get a snug fit - that's a whole different ballgame!Thank you all for your suggestions. I really appreciate it.
I am curious- what would you use to fill a tap hole in order to re-tap it?
For a clarinet that has screwed-in posts, I would remove the post, fill the thread with silver-solder, re-mount it, re-drill it, and re-tap it....I am curious- what would you use to fill a tap hole in order to re-tap it?