FlashForge Creater/Pro spring loaded extruder block

I recently am trying to print NinjaFlex, but the vanilla extruder block just won't work...
I tried to download other extruder blocks from thingiverse, but seems like my extruder block cam with a bigger wheel...
So I just designed my own.

I'm such a big fan with 3d printed springs, so I decide to make one that utilize least external parts.

for this, you need:
1. wheel x 1
2. 5mm (or 7mm) M3 screw x 1
3. 10mm (4mm outter / 3mm inner) copper pipe x 1
4. 20mm M3 screw x 1
5. 7mm M3 screw x 1 (less than 10mm including its head)

This is more like a "proof of concept", I'm still adjusting the tension of spring.