That wheel looks to have been built without nipple washers.

(An error.)

If you cannot find proper washers look for "backup plates" sold for blind rivets; they come in steel, stainless, and aluminium.

(For the error hole, use something that spans larger than the dimple - even if you work it back to shape.)

If you know how to use a flame, anneal the spot where the dimple is before working it.