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You could avoid using glue, since the wedge alone should already hold it in place with friction. If your handle ever breaks it will be easier to replace with no glue in it
Simple explanation: F=m*A. Since F is the force with which he strikes, A = F/m so for the same force, the small mass accelerates faster. The block has more inertia, lower acceleration. The friction between the two prevents it from slipping. But the spike in force makes the lighter handle accelerate faster which drives it in. You see his hand is still moving up and down with the handle. The handle gets an acceleration that overcomes the static friction, then the dynamic friction slows down the relative movement until it is locked in, he pulls the handle up a bit and the cycle is repeated.
This is very cool! How was it made? Chiseled for the pattern and then cut about three quartered depth to create the flexibility? I'd love to try and replicate it!