16x4 trapezoid screw hub using coins and bearings

This is my another take of remixing "threadless ball screw" into threaded rod.

Generally this approach works amazingly well , as for cheapskate design - perhaps not ultra in durability but given how cheap and available parts are it is just great for many designs which require no backlash and high precision.

This time i picked on bigger screw - 16x4 trapezoid - which is very cheap to get where i live , is very straight (usually sourced in cnc stores for cnc purposes) with just only one con