how to make a turn lever

Question

Do it yourself

It is necessary to come up with some kind of mechanical structure for turning the pin, I have been spinning around it for two hours and I can’t overcome it.

The bottom line is this:

There is a stud that can turn 100 degrees, and there is a servo with a rotation angle of 180,
you can’t directly connect the servo shaft with the stud (butt), you need to do it all with levers, can someone tell me something?
I tried both the rocker and with one lever, well, nothing.

Answer 1

The same rocking chair as on the servo (cut out a mona from 1.5 mm fiberglass) and two rods, probably in no other way. The main thing is that the shoulders of both rocking chairs are of the same length and at the same height, otherwise there will be extraneous forces.

Answer 2

With such a large angle of rotation, the lever will not provide a constant torque. Here are some reasonable options:
1) a toothed belt;
2) a pair of gears;
3) two pulleys connected by a cable. To avoid slippage, the cable can be attached to the pulleys. See how old receivers are driven from the tuning knob.

Answer 3

Is there no pasik?

Answer 4

Or maybe it would be easier to put a stepper motor with a hollow shaft and limit switches?