It's a thing with me for blades to be centered. Most Case knives I've purchased in the last several years have REQUIRED blade centering. I generally use a mallet ... with the blade of the knife opened to 90 degrees, or half-stop if it has one ... and ping the blade with the mallet with the knife laying flat on a table on its side, to encourage the blade to center when closed. It doesn't take much blade movement near the tang to make a "big" difference out at the tip.
Thing is though ... while my Sod Buster (full size) centering was WAY off and the blade almost into the liner ... I.could.not. get the thick blade to budge using the mallet method. So what I had to do was open the blade 90 degrees, secure the handle in a vice at the blade pivot pin and manually pull on the handle in the direction it needed to go. I soon got good results. Not centered perfectly, but close enough for "government work" and I could perfectly center it with time and effort. Far as I'm concerned, it's good to go LOL.
EDIT: DISCLAIMER ... mallet method is not for the faint of heart. I shattered a blade on a $100 knife this past summer in one mallet smack no harder than I usually smack. So try at own risk..
EDIT: DISCLAIMER #2 ... The vice method worked perfectly fine for the Sod Buster, but may not work for other knives. I guess one could tighten the vice so tightly the bolsters are pushed together so much it "locks" the blade down. D'OH !!! ... but again, no problem with the Sod Buster and I tightened it pretty good. Proceed at own risk.
Mallet I use. Not sure exactly why but I always use the yellow end ...