The front sight of my sks is completely siezed. I can adjust windage, tried buying one of those NC star adjustment tools from Flahertys, didn't fit so I returned it. I put oil on it and let it soak in for a couple days, tried smacking it with a punch and hammer, will not budge. Does anyone have any advice? I'm getting really frustrated, it's pretty much useless if I cant adjust the sight (its way off). Thanks.