Designed to fit on 4040 extrusion 

Parts needed

200mmx8mm rod or linear shaft

3x 8x22x7 bearings

8 x m5x45 bolts and nuts

1x 8mm lock collar 

1 x spacer to stop the lock collar rubbing on the bearing 

9 x Compression Springs (0.8x10mm OD,15mm Free Length)

3 x M3 x 22mm for the arms.

all parts should be sold on amazon, but will be cheaper on Aliexpress. 

Print the base test to check how the 8mm rod fits for calibration.

the spacer (red) goes between the spool holder and the bearings in the mount. Then the lock collar goes on the end (green). The rod needs to be a snug fit in the spinning spool mount.