An AI lens is easily dremeled. It can then never be used on a Nikon camera again. If you already own the lens, don't care about destroying its value, plan to never sell it nor use it elsewhere, then go ahead and chop it. Otherwise, better to sell it and buy a K50/1.2.
If you MUST chop it, look at the aperture ring. You'll see what I call the "nub and arc" protrusions. Just use a Dremel metal-cutting blade to trim those down. Smooth-off the cuts, blow away the dust, and the lens will easily force-fit onto a PK mount. For more security, cut a 1mm hole or slot for the PK lens-release pin to engage. Good luck!
Last edited by RioRico; 05-14-2012 at 08:55 PM.