Extruder-filament moving unit for 3 and 1.75 mm

This is some extruder filament moving unit, that allowed to us 1.75 and 3 mm filament. It's has only 3 print-parts. For this assembly will be need:
1. roll-bearing ZZ626 19x6x6 1 piece
2. spring 9 mm (from plastic bottle spray) 1 piece
3. screw M4 x 40 mm 1 piece
4. nut M4 1 piece
5. washer for