I want to get the Diana lenses for use on my Pentax, but they only make the lens adapter for Canon & Nikon mounts.
I note that the Nikon mount is very similar to Pentax and I tested it on a Pentak K-01 in the shop today - fits in, but doesnt quite turn/lock in place so wouldnt be secure.

Given the similarities in mount shape, Im wondering if it would be possible to physically modify the Nikon adapter so that it would lock into my Pentax DSLR.
I know some people like bodging around with this stuff, I dont trust myself to do it without some tutorial!

I have the Diana mini if I want to blow a whole roll of 35mm, and the Holga for DSLR but like the image quality of the Diana more - I want this for some occasional digital stuff and video out of my Pentax K7.