Originally Posted by
due ruote
I don’t have another 120 hub, but I could just put a block of wood in there.
...you don't need a whole hub. If you don't have one, you can just take a nutted axle of the proper diameter and double nut it on each side, one nut inside each dropout, and one nut outside each dropout. Working a frame to pull it back into plane is a lot easier without the wheel in place, because the rim and spokes always seem to be in the way when you want to grab or pry something.
Not certain how you intend to secure the block of wood.