Tap Holder

I bought a set of taps but forgot to buy the tap holder. So I designed the Tap Holder based on google images and measurement I got from the taps. The beefyTapHolder is based on Marius Hornberger (youtube.com/watch?v=RRdr16loUSg) design. I couldn't find any coupler nut he used in the video, so I designed something similar. The design is surprisingly sturdy. I was able to successfully tap aluminium block, wood and plastic.
The beefier one uses M8 nut and bolt but in my image I have used some imp