From eBay I purchased a VAR fork alignment fixture long ago.
it is for checking the fork and as Doug wrote the fork is to be removed to manipulate.
Like Gugie, I have made my own tools for “encouraging” them straight.
long ago Park made some too.
one method that the shop owner I first worked for employed was to have a number of short straight ga spokes, they would get placed on the fork in intervals and then “sighted” it would often guide the work quickly, exposing a blade that was taking a more direct route to the dropout.
the VAR tool does require the crown race be removed and as Doug also wrote set without twist.
I would not straighten any fork without the tools.
the other item to check after- barring mfg defects- of which did happen with more frequency than one would have hoped, do check the frame for headtube/seattube twist.
i always suspect those extravagant paint mid 80’s Italian frames. Even out of the carton.
i had a reputation for sending those back.
the distributor never argued. That shop owner learned not to notify the buyer the frame had arrived until approved.