Looks a lot like the 7 series, I will tell what I did to get mine apart.
There should be three filister head screws holding the fiber switch board which need to be removed.
Then remove the bolt on the back and the cup shaped piece with the switch spider should slide off the
end of tube. I can't remember but in may be important to pay attention to the relationship on the switch
to the groove in the tube. The pics I attached may be out of sequence, but you can see the relevant things.
I also took the opportunity to replace the frayed end of the horn wire.
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