The mechanism is for fork (1+3) Eb/Bb rather than a correction key for the long (1+1) Eb/Bb.  i.e. a fingering that is not available without it.

It may or may not improve the long Eb/Bb in the lower register which is the one that is always horribly sharp.  The upper register long Bb is normally perfectly acceptable tuning wise.

Oops, thanks for the correction!!

These are cool, but I don't think they're at all necessary. In the grand scheme of things, just another pad to need to seat and that can get out of adjustment.

Technically it helps keep the Eb/Bb in *slightly* better tune, but the meager gain isn't really all that noticeable. Cool to have, though.

Thanks for being the resident expert, Windsong!

pics

Thanks for the pics!

This is a toughie. The rings all look virtually identical, which I guess I'm not too surprised at based on Pedler often using the same hardware across time and space.

I would imagine that the item with the most similar texture is a match; in this case the barrel would more likely be a match with the rest of the joints.

However, I'm not a hardcore Pedler expert like some other folks here. Without a serial, its more of a mystery. But, In my (un)professional opinion, I'd say the body matches the bell, not the barrel.

Unlabeled joints are not uncommon. The real question is if the bell or barrel is the original.

You can compare the design and style of the metal rings on each section - if the two joints match, they're matched. If the ring/s on the joints match up with either the bell or barrel, then that's the one. Pls post some pics.

Could be a reed, or mouthpiece problem. What's your setup?

This is almost certainly a Malerne product - there's the telltale curved "made in france" stamp on the bell.