Just whip the centre out and adjust the spring if the pressure required is too great on the horn
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"Whip it out"... I hear the voice of Kenneth Horne, and there's today's pun.
Anyway, it's rather a fiddly job with the nine long bolts (my wheel has a spacer) and one has to take great care not to lose any of the little nuts and the tiny lock washers.
In between dismantling and reassembly, I adjusted the two nuts that retain the horn button. I think this has made a marginal difference but short of replacing the amazing horn spring, which is a miniature piece of engineering art, there's not much to be done.
