Well, chalk me up on the list. Got two of em that wouldn't break. What method or methods have you done to get them loose? I thought of a small punch and a hammer.

 

I take a ball peen and tap them or as you said a good sharp chisel and a light tap

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I got em out here last week. Top one was easy, but the bottom one, well you take a guess. I found 3 hex insert screw that were pretty much the same. 1.5 x .80 pitch. A lot cheaper than the dealer (came in 3 separate bags w/ Cummins on them, so I got an extra set of Genuine Cummins one now). I made sure to use anti-seize on the threads this time. BTW, no loc-tite was used to hold them in, as far as I could see anyway.