Important Notes:

As you see, the most important and unusual part, is the O'ring. it can be of any size, as far as:

1) it has top and bottom inner walls. this will hold the washer on the bottom and the plastic cap in the top, as you see here.

2) it must be of rubber, to have the flexibility to adapt to the form of the bottle cap and the washer.

When you already have it, you can buy a washer that has the same or slighter larger size of the O'ring

Solder the switch pushbutton in the protoboard with a couple of wires and glue it to the washer

Grab the wood stick, and put it inside the bottle cap and use the border of it to get the correct length and cut a part of i

With the part you just cut out, put in on top of the washer and use the top of the pushbutton switch whiteout pressing it, to cut it in the exact length needed.

Finally, glue the cut wood stick to the center of the bottle cap

If your spring is metallic, aislate the contacts of the pushbutton with a bit of tape

Insert the spring on top of the pushbutton switch and secure it with the bottle cap

And you just made it ! An arcade pushbutton with a plastic bottle cap and a couple of other materials!
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