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that's a good idea.sorry I miss understood you.
As a point of clarification...It doesn't matter if your shares sit in your margin or cash accounts. The shares are still listed in you brokers name and are available for shorting.The ONLY way to make your shares unavailable for shorting is to request that a stock certificate for your shares be issued and mailed to you.
I believe (although not certain) if you put in a sell order, the shares cannot be borrowed to short.If true, you could put a GTC sell at $50 and that would prevent those shares from being used. You could check with your broker to confirm this, but he would probably not be thrilled with the idea.