Robotic claw arm

A robotic arm claw for a claw machine:

I was missing a cool claw for a claw machine in the design process.

The idea was to create a simple, fast to print parts and is easy to assemble. There are two ways to connect the parts (See pictures):
1. Using a 3M screw
2. Using a wooden pin (from a BBQ wooden pool)

Assembly notes:
1. The base arms connect together around the top of the injection piston.
2. It is best to tie them using metal wire and glue them into place in 90 deg from each other on the piston top.
3. Connect the extension arms to the base arms using an M3 screw.
4. Connect the poles to the extension arms
5. Place the ring around the injector cylinder (don't glue it yet)
6. Connect the other side of the poles to the 4 ring handles using M3 screws
7. Adjust the movement to correct open and close movement by moving the ring up and down. Make sure that the claw doesn't freeze in over expansion (open) movement.
8. Once the ring is adjusted glue it to the inj