Step 1: Materials
A knex gun: Find one that's ram rod hits the bullet fully, instead of just touching the edge of the bullet
Step 2: The Cushion
After that, create a hole for the ram rod with your scissors.
Step 3: Tape It On
Then tape the cushion on so the hole matches with the hole in the gun.
Tape it down good.
Then you put the ram rod back.
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