12 February 2019
Okay, good job on the geometry, I see you have assembled all the parts with joints. The problem with using a Moment load is you can put in a value that is so large compared with the mass of the parts that the accelerations are huge and you need millisecond time steps to see it move.
Instead of applying a Moment on a Revolute Joint, I applied a rotational velocity. Now I could safely use 1, 2 or 3 seconds depending on the number I put in for the rotational velocity. So if I have 1 rad/sec and I simulate for 1 second, it will rotate 1 radian. Put that on the revolute between the long handle and the short link.