spoke to a mate about this, as mine don'r have the hole !
He said when they first came out they didn't have a hole - when the potts mod came out, then the hole in the fork was drilled as to keep up times
this is why some have a hole and some don't
easy to fix by just drilling out a new hole
now if some one can measure where it is that would help those that would like to have a hole in the forks
cheers B