Maybe Nikantax?
I've wanted to try this for some time. Turns out the Urban Myth is true :P
What I want to know is why didn't any of you tell me earlier? :P
Exhibit A + B
Click More Click
Actually to be fair it probably was on here somewhere where I read about Nikon Glass in a Pentax PK Mount.
(might have been mflens but I'll pretend it was here too:P)
I've been wanting something faster then the 35mm f3.5 Super Taks I have here. Nikon to the rescue! (Because I'm a tight arse) I'm looking at you 35mm f2 AI
As you can see it was mounted more or less upside down, It went a smidge past infinity but pffff. Providing the lens doesn't poke to much in I reckon it'll be fine. also providing you have an aperture ring naturally. It didn't rotate completely, but more then enough for it to feel secure. Still, perhaps not whilst rock climbing. I gave it a good wiggle much to my mates disgust and it felt fine.
Anyway This has just opened a whole new section of ebay to me. MMMhahahah