Author: jhoyla
Date: 2011-12-25 09:03
WRT your question "where is the main pivot?"
In Mr Seaton's picture, the main pivot is the really long screw that holds all of the keys in place.
They all rotate about this pivot. The screw is not marked in his diagram (it is not an "adjustment" screw).
In his picture the main pivot is facing you, and is vertical. Hold your top joint exactly like in the diagram. Now, tilt the top away from you through 90 degrees, so that you are looking up the bore. The main pivot screw-head is now facing you above the joint-cork, between the two G# keys (LH and RH).
Turn the pivot screw quarter of a turn, or half a turn, and see if the two little pads marked "C natural key" and Bb key" move with more freedom?
Try playing - has the problem gone away?
If so, it could be that the pivot has a slight asymmetry and that the keys have worn to accommodate it. This is not a solution - in this case, it is worth taking the instrument back to the shop and have everything straightened, possibly with a new pivot.
J.
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The Oboe BBoard
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