I took mine apart a few year ago. It had me stumped.
elebouef......I think you are correct about the set screw on the bottom side.
I remember taking the center handle nut off.....but don't remember if it just came out. I can access the back side where the throttle is mounted.
I was having trouble with the motor trim switch and/or relays. I tried bending the metal part that makes the contact for the switch. This seemed to help but the down relay still hanges up sometimes.
Let us know tomorrow if you need more help......I can look at mine to see if I can help you.
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