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Thread: 4th valve sticking

  1. #11
    Join Date
    Jan 2019
    Location
    US East coast
    Posts
    193
    This is what I mean when I refer to myself as a “novice”.

    You learn this kind of ancillary but very important information by growing up with it as part your instructional routine. I jumped right from “What’s a ‘piston’”? to Rochut, but there’s a whole lot in between.

    Learned something I consider an essential today!

  2. #12
    Join Date
    Dec 2015
    Location
    Varese,Italy
    Posts
    384
    In addition to all the causes mentioned so far, it may be that the tolerance between the chamber and the piston is too tight and, consequently, there is a problem of attachment. Look at the piston and see if there are any smooth areas on the surface, as if they were mirror polished which differs from the more opaque rest. If so, you can try to lightly sand the shiny surface with fine sandpaper or cloth (grain size 1200). I have done this operation in the past on various horns with success without compromising the seal.
    Last edited by franz; 10-26-2022 at 09:51 AM.
    2007 Besson Prestige 2052, 3D+ K&G mouthpiece; JP373 baritone, 4B modified K&G mouthpiece; Bach 42GO trombone, T4C K&G mouthpiece; 1973 Besson New Standard 3 compensated valves, 3D+ K&G modified mouthpiece; Wessex French C tuba, 3D+ K&G modified mouthpiece.

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