That's a mighty small hand - drilled pinhole; good work.

I'm assuming that you discovered the need fot a good seal the hard way (we all do that), though thank's for pointing it out, as I don;t want to learn the hard way with 4x5 Ektachrome.

And flocking the inside with black paint is probably a real good idea; internal reflection does some odd stuff, though with some cameras (read: Holga), that can be cool. I'm more going for the high - qualiity pinhole end, so whatever can be done to improve the picture, I will do ...