Neptune's mod for FPSB 4th
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Neptune's mod for FPSB 4th is a Double sided mod made by Neptune. As of writing, this mod has no official name.
Construction
Parts needed
List from the pictures below:
- 1x Pentel Keityo Sign Pen (barrel)
- 2x Unnamed markers (caps)
- 2x Old french Dr. Grip (tips)
- 2x Sailor IC Liquid Gel (grips)
- 1x X-power (grips)
Text tutorial
Preparation
- Cut the clips of both markers's cap.
- Cut 2x 1 block and 2x 2 blocks of Sailor grip. (the total number of stripes used is 12, cutting 2x 2 blocks can be optionnal)
- Cut 2x 3 blocks of X-power grip.
Assembly

- On the unnamed cap, add: 3 X power blocks, 2 blocks of Sailor grip and the remaining big blocks of Sailor grip.
- Push the Dr.grip tip inside the Sailor grip.
- Repeat on the other cap.
- Wrap tape on both ends of Keityo barrel and connect.