Ingenious ideas! Note to Wade: If you get a chance to try it on your tuba that has a set screw in the valve cap - if possible would you please measure the length of the set screw? I'm assuming the diameter is an M3, but if you think it's much different and have a chance to measure the diameter as ...

Thanks for your comments. I will try printing one the way you suggest. I don't know if the 3D printer can make the bridge over the void, but it might and the result would be superior as you describe. I printed it with the nut retained in a 3mm thick disc which is CA glued to the bottom of the top ...

I agree that no one would install it on the 5th valve. I did that only so that I could photograph it clearly. Otherwise, they can only be seen from the side. https://i.imgur.com/5jIIZZA.jpg After seeing them installed on my tuba, I thought they might be less conspicuous painted with a metallic brass ...

Thanks very much to Forum Administrator Mark for steering me in the right direction about posting photos. Here's a photo of the valve extender sleeve mount on the 5th valve of my tuba because that makes it easier to see without being buried in all the plumbing. https://i.ibb.co/f2qSXNC/IMG-1658.jpg ...

Thanks very much to "the elephant" for sharing his thoughts a pictures of the valve cap extender. My original prototypes were going down the road of completely replace the valve cap, but he had the brilliant idea of reusing the existing nickel cap and have just a sleeve extension. Yes, the idea is ...

My apologies if an AirTag hiding place suggestion is too late, but I'm new to the forum and just now reading the posts. An idea that occurred to me is to take advantage of the screw-on cap on the bottom of the rotary valves. It would not be difficult to duplicate the cap using a 3D printer and ...