Hi Don. Yes I love tinkering too, and it sometimes keeps me from making images. (Not enough hours in the day.) I think Ned's comment is spot-on when he suggests that the pinhole is being obstructed. As I look closely now I can see a definite ridge formed by the hole in which the pinhole sits. I'm going to take the pinhole out and bevel the hole, and see if that makes a difference. I'll post some images as soon as I've fixed the problem. All the best to you.
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