Self made Cox .049 set screw Spinner hi performance type

Today I decided to make my own spinner I wanted a model with no looseness in the treads this was achieved wit a smaler tap used in a slightly larger Hole for it but smaler than the od of the set screw i used a 4-40 tap and after i insert a set screw by force of some sort result no loose in the screw i make a test wit a dremel tool bring the parts To 53 000 rpm no vibration just Perfect i made a Litle video of the test