Cork rotary valve bumper change?

[IkeH]

I believe what you're looking for is buna rubber. It doesn't have the bounce that neoprene does and lasts a long time. You can get it from a supply place that sells gaskets, etc. pretty cheaply by the foot in different diameters. Try a couple of different diameters(6mm-8mm?)to get a tight enough fit in the holder and the desired size to make the valve stop in the right place(check under the cap). Different valves may require different sizes. Take an old one with you to get the right size.

Ike

[Chuck(G)]

When buying O-ring material, it helps to know how to talk the talk.

The "hardness" of an o-ring material will give is denoted by the term "durometer". 20 durometer, for example, is very soft; where 50 durometer is quite hard. You might, for example, want to use a hard material on the "key depressed" stop and a soft material on the "key return" stop.

http://o-rings.globalspec.com/

[SplatterTone]

Ashbory bass strings
viewtopic.php?t=11204&highlight=bumpers

[tubafour]

Thanks for your help, guys!

I decided to take my horn to the local music shop (Music Doctors in Johnson City, TN). Teresa changed all 4 return bumpers in 15 minutes for only $1. She trimmed them all, and even confirmed that my valves were properly aligned afterwards. Wonderful!

If anyone is in my region, take your horn to her!!!

[Dan Schultz]

Teresa changed all 4 return bumpers in 15 minutes for only $1.

I'm going to start sending my stuff there!

[Chuck(G)]

Thanks for your help, guys!

Don't mention it! Our pleasure.

I decided to take my horn to the local music shop (Music Doctors in Johnson City, TN). Teresa changed all 4 return bumpers in 15 minutes for only $1. She trimmed them all, and even confirmed that my valves were properly aligned afterwards. Wonderful!

If anyone is in my region, take your horn to her!!!

The same job at the local music stores would likely run in excess of $50. (They charge a full hour labor for fractions thereof.)

[k001k47]

bump . . . (no pun intended)
'Found this thread useful and cool.

[Jose the tuba player]

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[Roger Lewis]

Here's a web site that I recommend to anyone wanting to learn about rotary valve maintenance. It's Jeff Funderburk's web site at UNI and the videos are excellent.

http://www.uni.edu/drfun/repair_video/r ... index.html" target="_blank

Also I was lucky enough to find the exact size rubber rope for Miraphone rotary horns that requires no trimming once it's installed. Makes the job a lot easier.

Roger