M5 Adapter from Brass Nut to 5mm Threaded Rod

My Anet A8 B came with TR8x2 for the Z-axis, but I had some trouble with the wobbling and imo the pitch was to high for good resolutions, so I decided to swap to 5mm threaded rod.
On the pics you see a printed coupler, but that was more good looking than good working caused by the missing flex element, atm I use the cheapest and easiest way between 5mm shaft and M5, a piece of PVC tube like it is used for fish tanks with an inner diameter of 4mm and I'm really happy with it cause it's nicely ce