>>3255294I found that taping the pinhole to the inside of the cap, after using a black marker to color the metal and hole black, did the best for light leaks. Also, if you get one of those cheap bellows from amazon for like $25, you can fit just about any pinhole or single element lens to it. then you can adjust focus as needed without much calculation for the pinhole size or need for making a focusing mechanism for the lenses.
