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 imperial nut and bolt that I had laying around. If the metric nut is loose use epoxy to hold it in place. For the smaller tap holder to hold M4 nut use epoxy. (its not a press-fit and its made intentionally big for using epoxy if the nut is not in place the whole thing won't work) The bigger one uses 5 nuts two inside , two outside and one to keep the bolt in place. Its easier to put the nut inside just use pliers to press it in. Smaller Holder is easy as it has only one nut and the rest is self explanatory. If you have any query feel free to ask. This is my first THING please critique it so I can improve :) If you got an idea for a different tool and you cant design hit me up. I will give it a go :) P.S : I hate Imperial ;P