pentax mount for Tamron 90/2.8 manual focus

[jpcc]

I have a 90mm/2.8 nikon mount (manual focus).
It has a detachable mechanical Nikon F-mount.
Can i detach the nikon mount and buy a Pentax mount?
Any idea where and how much?

 

[longko]

I have a 90mm/2.8 nikon mount (manual focus).
It has a detachable mechanical Nikon F-mount.
Can i detach the nikon mount and buy a Pentax mount?
Any idea where and how much?

Adaptall right? I saw some on ebay