I'm in the same boat, I actually had one drop for me a month ago doing the repeating Eris kill three blades of Crota bounty and I trashed it without thinking. Then this past weekend the Crux dropped for me and so I've been spending about 45 minutes a day running the Fist of Crota mission over and over. Basically I just sparrow past the opening baddies directly to the Blade of Crota guy, kill him, then restart. Over the last five days I've probably ran it about a 100 times and so far no Husk of the Pit drop. I guess it is a fairly infrequent drop.
I'm still kicking myself for trashing that gun when I had it.
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Don't beat yourself over it, it's not worth it. The exotic Necrochasm is really bad. We thought it would get buffed at some point like Thorn but they never did.
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I only want it because I'm a bit of an exotic collector. I know it is a crap weapon even when ascended to exotic, just didn't realize at the time that common Husk of the Pit I had picked up is what could be turned into an exotic.
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I see. Well in that case I understand. Good luck finding it then.