Just a note, not sure if this applies for the heq5 pier extension, but i just bought the eq6 version and immediately had issues with it slipping and turning. Its designed so that the the bottom attachment to the tripod is only secured by the centre bolt without the azimuth bolt to sort of secure it in place. This means that if the centre bolt isnt deathly tightened on the extension, your polar alignment is most likely to slip.
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