I couldn't find a screwdriver that fits nicely in my pocket, has room for a couple of bits and is thick enough to grip, so I made one. This is my first model so I had some difficulty with the thread at first. I press-pulled the female thread by 0.2mm at first and it was too tight. 0.4mm was unnecessarily loose, so I ended up using 0.3mm which seems just right. I don't need a pocket knife, but I have missed a screwdriver. I hope this works.