Hi all, I have an old Pan-American tenor from around 1937. This is almost identical to a 10M, according to my tech who had just overhauled two 10M's, but lets not open that debate again! The horn has been well sorted, and plays well with no leaks, sounds great. Tuning and intonation is not as locked in as my more modern horns, but is fine until high F/F#. These notes are flat, regardless of fingering, mouthpiece or reed. The F I can just about get up with my throat, but the F# is noticeably flat. When the neck was re-corked, we saw that it had been extended, presumably to allow the use of more modern mouthpieces. My pieces are Ben Allen 20TD, a large bore piece, and I've tried my old metal link, which you would think would work well. Both these pieces need pushing well onto the cork, the link actually needing to be pushed beyond the cork. My Guardala high baffle screamer is being borrowed by a friend, so I haven't tried it. The F key seems to open a good amount, but I haven't got anything to accurately measure it. Any ideas? Key height? A neck issue seems unlikely cos everywhere else on the horn is o.k. Discuss !