The OP is referring to a Debit Spread. His concern about being assingned on his short position is unfounded and he isn't screwed, the position is at or very close to maximum profit. The best thing to do is to close it, problem solved.
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Fair enough, but even if it's a debit spread that's in profit, I believe your margin would increase as you're assigned the shares. What if you're assigned with just like 5 cent profit on the spread...and now you're given thousands of shares instead that you have to hold.