There are several ways to force covering. All involve an audited share count for some greater purpose. One is to offer a dividend to holders of record. Another is movong to a new exchange, which forces an accounting of shares. That's why moving to OTC is such a strong move.
Someone earlier mentioned asking for certificates. My experience is that uncovered shorts don't care about certificates. All certificates do is reduce liquidity and therefore allow shorters greater support for their sales.
Not saying there are not advantages to holding certificates. Just saying that calling for a movement to request certificates only creates a false sense of doing something. IMHO
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