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Finally got it unscrewed. Had to use the biggest strap wrench I've ever seen, and it still took a very large man to bust it lose.
As it turns out, the spring on the bottom of the actuator was not as long as it should be -- too many compressions over the years. A new spring was only a few bucks. I highly recommend a new spring if you haven't had one in over 30 years. It's the only way the internal locking mechinism will work.
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