I'm having issues with light strikes on my 9mm loads. Will always go off after a second attempt, but on inspection I'm able to discern a very slight cant to all of the primers. This is a new problem, I've primed thousands of cases successfully and uniformly with this tool before. (RCBS universal hand primer). Appears to be limited to my hammer guns - Fraulein Glock eats anything I feed her without complaining.

I think with slightly more distance to the throw, the tool will seat the primer correctly. My idea was to shim the seating rod in it's cup with one or two thicknesses of paper, but wanted to get the go ahead from heads more knowledgable than mine first. Ideas?