Why are my magnets not working?

I converted Japanese to English with translation software.

I don't know the details only with the thumbnails you uploaded.

I uploaded the sample to Dropbox.
https://www.dropbox.com/s/36ex3mvjjivo4c8/magnet-sample.puppet?dl=0

The magnet is turned on at number "1" on the keyboard.
Press number "1" again to turn it off.
Although it is Japanese on YouTube, the explanation has been uploaded.
https://youtu.be/nJH8iY7i4Po
The weight of the gun was set to 0 because the gun usually falls down due to gravity.

I think that the problem will be solved if you make it with a similar configuration.

Than You.