My son's tenor has lost its bell screw. Anyone know what size this screw is? I'd like to try to get a replacement to get him by until the band tech can fix it next week.
Don't underestimate those Yamahas. They like changing things outside of the bore, and tonehole placement. In fact, they like tweaking things just as much as Selmer does in that respect.I have some stock screws for YAS-32. They are probably the same thread. The thread is M4x0.7mm, i.e. standard 4mm metric thread.
As long as you have the correct thread there will be no problem of it being steel.
But if it is too long, and you tighten it hard, you will damage to the mounting of the female-threaded part.
(These ones are 8.4mm long, excluding the pan head.)