You should be able to find enough left hand drill bits at the better hardware stores or automotive parts stores for your need. Might want to start with automotive stores as they are realative common to remove broken bolts. There are also tools with different head designs to engage those damage heads. Can you get a very thin pry bar with a "V" in the end of it behind the boards to slip around the threads to give the screws something firm to back out against? kt

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