Hey I just half blocked my spyder pump and I realized that the bolt doesn't stay in place now take a look why. I cut to deep and the pin doesn't stay in now. How do I fix this

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I look at everyone elses gun sales and I say " Damn, why don't my threads ever look like that?"
All your guys flashy colors and girls with 50 cal. amunition belts wrapped around them with their bikinis on! I realized I need bring it to the next level. I still haven't thought of how to but for now I'm clueless
SPUMP THREAD
http://http://www.pbnation.com/showthread.php?p=73584031#post73584031