TromboneChat

The linkage on my Bach 42BO is unbelievably noisy.
What a good replacement that is quiet ?
It`s going to attach to an Olsen Valve

Real MINIBAL miniballs

Sure the lever pivot isn't also worn, and/or you don't need new bumpers? Black nitrile rubber for the open/thumb pressure position, softer clear silicone for the return that gets constant spring pressure will give max quiet without inconsistent alignment

Separate question: how did the bell brace end up on the valve knuckle rather than the slide receiver? Guessing whoever installed the Olsen valve didn't account for it being larger than the standard rotor and didn't shorten/replace the gooseneck to suit.

Good eye…..ithinknot! There are definitely some strange things going on with that bell section. It looks like the slide receiver was cut down to a shorter length. There are no trim lines on that receiver and it is almost as short as a receiver from a straight gooseneck. My guess would be that there are few other oddities in that custom job. Some, of which might be contributing to the rotor noises.

There are many things that can cause a rotor to be noisy….worn linkages, worn bearing plate (usually not the issue with an Olsen rotor because of the ball-bearing design), loose solder joint, hardened bumpers, etc….. It is best to get it to a qualified technician so that they can check all those things. It might also be a good idea to get the rotor completely repositioned (shorten the gooseneck) in the process.

I will say that Olsen valves are always a bit noisy- the ball bearings themselves do make some, even if perfectly oiled and aligned.

Yeah, someone was DEFINITELY NOT paying attention to that brace install...among other things!!

The bearings on the Olsen valves are great for quickness, but are a bit noisy. I just put some heavy oil under the stop arm along with softer bumpers.

Looks like the tech used the shorter 42 handslide receiver, instead if replacing it with a longer 42B part.