hello to everyone.
i bought a second hand road bike,and i have some suspicion over the fork,it looks a bit bent back.previous owner told he had a very minor crash.

i want to find some ways to diagnose the exact problem (if it is,which blade is bent,to which side,in what extent,etc)

one clue is that when i put the wheel in place,it seats with an uneven gap between the blades,as if the one forkend is longer than the other.in other words the tire isnt centered below the brake bolt.the wheel is properly dished.tried both ways.

is this the case,or its just a poorly made fork with uneven forkends?

is some way to trace out the fault? some string method?

frame material alu
fork steel.

thank you