When I needed longer studs I went oversize not that they were loose just that no-one had longer studs with my knurl. I think I bought .490 knurl. Just a tad bigger but they pressed in no prob.
Checked it beginning of the season. I think it due to excessive current because my distributor is locked and she starts real hard sometimes. Never done that before dizzy was locked out.
I will put the springs back in for next season so that should fix it.