That link is to their complete custom rebuild/rehousing which includes the PL mount and a waiting list of over 6 months.
Modding a standard Tokina would be much simpler. The aperture on the Nikon mount Tokina has no clicks as it's a "G" type lens. Just interested in what he had done.
I recently have a few Zeiss lenses modded by True Lens Service in the UK. Did a great job. Declicked, Focus Ring, 80mm fronts and lens caps.