@MichaelGoode ... Great article on your webpage. https://www.goodetrades.com/2009/09/how-to-borrow-shares-to-short/
Just to inform and update you. I'm currently a Tradestation and Interactive Broker client. The Tradestation platform have a "Short Locate" function, which search for HB securities. About 20-30% of the times when IB does not offer shortable securities I can find them at Tradestation. It takes around 30 sec up to 15 min (80% of times I get an answer within 2 min) to get the answer from a "locate request" - using their inbuild platform locate tool.... Thank you for all your great work (I have recentley bought the (How to read SEC filings) I really like your in depth academic style YOU ARE THE MAN!