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Part for bass clarinet

Hello everyone. I’m fairly new to the bass clarinet. I’m having trouble with breaking off and losing a tiny bumper-like part that is on the low Eb bell key of my Backun bass clarinet. It’s needed so that the key pad covers the hole on the bell. Photo is attached. Hope it’s clear enough. Can someone tell me the name of this tiny but essential part? It comes off very easily unfortunately and my local technician has replaced it once. I’d like to order a supply of them as it seems I’ll need them! Thank you.
 

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So a couple of questions:

  1. Is this a low Eb or C model bass?
  2. Is it made of wood or is it synthetic? And lastly:
  3. Do you know the model?
I took a look at the Backun website and can't quite ID the part I'm looking in your photo. My bass clarinet looks very different--it's a mid-century German one ;)

Whatever part keeps coming off, it shouldn't be. You really shouldn't need a bunch of them, you need a proper fix.
 
This is a synthetic low Eb Backun Alpha bass clarinet. The low Eb key is attached to the bell. When you twist the bell on to the lower section you need to depress this Eb key to keep it from hitting the round lever that causes the key to close over the hole. See new photo. There is a very small bumper part attached to the end of the Eb key that silences the movement and is needed to completely seal the hole.

Apparently I was not careful enough to hole that Eb key doen when assembling the instrument so that bumper was ripped off.

Sorry I don’t know what all these parts are called.

Thanks for your help. I may just contact the technician and ask him for another bumper.
IMG_0110.jpeg
 
OK, I get it now. It is the same as on my German bass clarinet.

Your tech can order the part.

Bottom line: it was operator error that caused the problem. ;) Until the part arrives, you can use some moleskin, or even a Bandaid to cover the area. That's what I have on hand for emergency repairs of all kinds.
 
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