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 bocal/crook cork repair
Author: mddds 
Date:   2018-09-05 23:16

hi all,

im a clarinetist who recently purchased a used EH. (to my surprise, i found similar keywork and fingerings to the clarinet.)

Anyway, the cork on the 2 crooks need replacement.

i did a search on this board but didn't see a recommended thickness of cork sheet.

also, any specific recommendations on adhesives?

p.s. some clarinet mpcs have rubber rings/gaskets instead of cork. i wonder if that would be something to look into also. i guess it might require grooves/housing for the rings to reside to prevent migration.....



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 Re: bocal/crook cork repair
Author: mschmidt 
Date:   2018-09-06 20:56

I just had a bocal cork replacement done by a professional repairman. He said that EH bocal corks were a bit tricky, as the outside of the bocal is usually tapered, but the socket into which they fit is not. He may have just been trying to convince me not to try fixing it myself in the future, of course. But it's sometimes worth it to pay someone who has experience.


Middle-Aged Amateur

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 Re: bocal/crook cork repair
Author: Chris P 
Date:   2018-09-07 13:39

It depends on the diameter of the socket and the thickness of the metal of the crook - so some will do well with 1mm thick cork and others (with wider sockets) may need 1.6mm thick cork so the crook cork can be made with parallel sides to keep it secure in the socket.

Like tenon corks and key corks, the crook corks are glued on with contact adhesive (Evo-Stik or similar) and the outside has to be sanded down to make the sides parallel which isn't easy to do purely by hand.

I use a wooden mandrel mounted in my bench motor chuck and the crook fits onto that so the corks can be sanded down whilst spinning to get the diameter and shape right as well as even. They should be an easy fit in the socket with a bit of resistance when greased, but not loose so they spin around or rock, or so tight that you need two people to remove them.

If you are planning on having rubber O-rings fitted, you're best having a close fitting metal tube turned up to fit into the socket with two or three grooves for the O-rings and tapered on the inside to slip over and fit on the wide end of the crook, then soft soldered in place.


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 Re: bocal/crook cork repair
Author: mddds 
Date:   2018-09-07 20:56

thanks for your advice.

i think i'll have it professionally done.

it's nice to know the details that go in to it.


Post Edited (2018-09-07 20:57)

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