Wanhao Duplicator 6 Spool holder bearings insert

I felt a bit compelled printing tubes and finding M8 bolts. So instead I've designed an insert which has bearing to decrease spool friction using a pair of 625 and one 624 bearings. Insert goes into existing spool holder turned upside down.
You'll need:
2x 625 bearing
1x 624 bearing
2x M5 socket head screws (minimum length is 10mm)
1x M4 button head screw (minimum length 14mm)
1x M4 nyloc nut