Misc. Most suitable pad for 3.17 mm d. shaft to be as 5 mm one

[abdulbadii]

TL;DR Summary

Understand to solve 3.17 mm d. shaft function as 5 mm one

Anyone understand to do as correctly as possible on 3.17 mm d. shaft function as 5 mm one, as the available affordable is motor shaft 3.17 mm diameter and the (leftmost image of adv.) connector/adapter of 5 mm diameter M10 ?
So what'd be the most suitable pad/filler and how is to do it?

 

[jrmichler]

I think what you are asking for is a sleeve to adapt a 3.17 mm shaft to a 5 mm hole. If so, try searching Amazon using search terms adaptor sleeve 1/8 inch to 5 mm. That search found a number of sleeves such as this one:

The hole in the side of the sleeve is for the setscrew to go through and press directly on the 3.17 mm shaft.