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Hi everyone!

A while back we did a conversion on an Alexander BBb Tuba. The idea is to switch the noisy old worn out bearings on the S shaped lever arms with mini ball bearings which are held into the stop arm with set screws instead of a tapered steel pin.

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ABOVE: the original linkage

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ABOVE: STEP 1: remove the old bearing from the lever arm

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ABOVE: STEP 2: solder in new mini ball bearing to the lever arm.

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ABOVE: STEP 3: the stop arm has to be tapped out for the proper set screws

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ABOVE: The finished linkage - smooth and quiet.

Let me know what you think.

I will post some more accessible photos in a bit...