One of my main bolts, #4 main on the outside is tight when trying to screw it down. it was tight before but feels worse now. I put another bolt from another cap there and it went in fine. Looking at the bolt i can see the first thread looks shiny like maybe it's been eaten, also the bottom part of the bolt is not flat kinda wavey. I'm worried that with the extra tension to drive the bolt down that maybe it would affect the torque. Not sure if this is critical or not. Can i just chase the bolt with a die? Is it 1/2-13, looks like it.