When I first made this pen I had a different cap. It was in need of a new one because I made the water too hot in the Sonic bath when cleaning. (Thread became useless). I also found this beetle in the yard that matched it well. M13x0.8T, M10x1.0 , Bock #5. C&C welcome
The shape of the hood should be smoother, I don't think the color combination is that nice, but that's taste and you shouldn't care about it. As long as you think it's beautiful.