Have you ever tried TIGHTENING THE DAMN HEADSET?
channel locking wrench + those nuts right under your bars + turning in a clockwise direction = HOLY SHIT.
TIGHT HEADSET!
Save the effort and just buy a new threadless fork. Seriously.
Or find the right sized tube, cut off the threaded part on the fork and weld the threadless tube to it.
I've gotten so many things from the junk yard.
like 4 b models
and a bunch of old as with lights on 'em, kick stands, shock forks, etc.
two bomber decks are best though haha, huffy micro and some oddity old a but longer.
If you're fine with 4.0, why change?
If you want more deck room, then the 4.5 is for you.
It's only a half inch on each side, not too much weight can be added.