K8400 Rods Lengthwise Movement Stopper

After using Vertex K8400 printer for about 6 months I discovered that rods started to move lengthwise due to worn out plastic end-caps. Several solutions addressing this have been posted here, but I decided to come up with my own that uses steel balls from old 608 bearings. The balls allow to minimize the area of contact with the rod, which reduces friction.

You will need 8 balls in total. One bearing contains 7 balls, so you will need to disassemble 2 bearings.

You will also need four M