I took one of mine out of the plastic and it's got a gap on both sides too; I'll have to take a look at the others. I wonder if that's why Swamp Rat stopped doing Res-C...

Anyway, I'll probably just buy a little tube of Permatex black silicone sealant/RTV at AutoZone and fill in the gaps; that'll cost less and be less bother than sending knives back.