It's easy and simple. Just place a GTC order at a high price (say $20 bucks) and your shares can't be borrowed. If they are already borrowed the broker has to call in the short to replace those shares. If everyone long did this the stock would go straight up.
Many retail investors think by placing a Good Till Canceled order (GTC) they can prevent their shares from being lent. A quick survey of some brokers indicated this to be more of a myth than reality. While some brokers may act as such, most don't recognize an open order as prohibitive of lending shares.
you are an idiot - placing gtc orders doesn't prevent your broker from lending the shares besides your lousy small long position doesn't amount to a hill of beans- how many jcp shs are outstanding lol