Magic Coin Piercing Trick V.2

Thank you dnewman for providing this great trick!

During the first attempts to perform this trick, I noticed two things that should be changed:

… Lid very loose
… Coin diameter a bit too small

As the lid is very loose, you are obliged to fix the whole device with several fingers and insert the pins at the same time. This is especially difficult for younger children. There is a possibility that the whole device will fall to pieces during the demonstration.

As the coin diameter is rather small, there is a possibility that when you first pierce the edge, you will miss the coin while piercing and then the coin will not stand up vertically.

I have made the following changes:

... reduction of the lid diameter by 0.4mm
… inside the lid a 10mm notch was made on both sides to fix the lid.
… outside the lid a mark on both sides for better orientation when putting on the lid.
… Ø of the coin increased from 30 to 32mm.

Because of the rotation of the lid, the insertion poi