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Step 2Find a hollow tube for the core.
One of the best types of plastic tubing I have found was from a PaperMate Write Bros. Grip ballpoint pen.
I just peeled off the rubber gripping, unscrewed the pen, and took off the plastic tube.
Just like the second picture, you need to measure and cut plastic tube to the correct length. In the picture I measured it against a Duncan bouncy ball CW, but for accuracy you'll want to cut it to a length of 2.80 cm.
The third picture is of the plastic tube I got from the PaperMate pen (top) and the lower two were cut from an empty ink cartridge from another ballpoint pen. These were abnormally larger than ordinary ballpoint pen ink cartridges and noticeably stronger.
I just peeled off the rubber gripping, unscrewed the pen, and took off the plastic tube.
Just like the second picture, you need to measure and cut plastic tube to the correct length. In the picture I measured it against a Duncan bouncy ball CW, but for accuracy you'll want to cut it to a length of 2.80 cm.
The third picture is of the plastic tube I got from the PaperMate pen (top) and the lower two were cut from an empty ink cartridge from another ballpoint pen. These were abnormally larger than ordinary ballpoint pen ink cartridges and noticeably stronger.
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