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None of my mouthpieces seem to fit properly in the leadpipe of my Cerveny AEB 641 Eb.

I like my PT-72-S, but you can see that it does not go in very far. Observing the inner diameter of the leadpipe, one notices an inner ring that seems to diminish that measure. I do not know enough.

Would some kind of modification to the horn make sense, or have I not found the right mouthpiece?

What am I missing?

Thanks!

is your PT an american shank? if not, get one

Cerveny leadpipes go all the way to the end, the sleeve is just for protection and mounting to the bell. There is no receiver in the traditional way

Yes, the PT mouthpiece has the smaller shank offered.

Thank you for the info!