I don't know if this should go in the wheel and tire section or the inside and out section but I'll put it here for now. I got 20mm spacers for my car and I'm on stock suspension. However, I'm about to lower my car on S2 springs so I want to take my spacers off until I can roll my fenders. However, when I tried to take them off, i couldn't get the center core off. I had to tap it on with a rubber mallet, but it seems to be stuck on there. Any suggestions on how to get it off? I can't damage the core because I'm gonna put them back on after i get an alignment and roll my fenders. Any help would be appreciated.