Hello Daniel, why do you want to change this action ? It is much easier to push (in) the valve (for help with the Bb) than to release it (see the beginning of Rheingold !!). And if you play e.g. Strauss op.11, the beginning of the solo (not the initial fanfare) with the octave slur is much easier started on 1F & push the Bb trigger to arrive at the one octave higher f (with 1Bb), or from the two f2 before high Bb, playing the first f2 on 1Bb, release for the second f2 (1F) & kick you up to the high Bb with the trigger, like kicking yourself into your back to jump. Think about before changing the trigger.
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