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Thanks Dennis and Paul
I'll check out the site you suggested Dennis.
I recently purchased a book by Michael W Swanson - The Nexstar Users Guide - in it the author says the older control fitted to the 60, 80, 114 and the 4 Which had a fair list of problems was replaced in Dec 2001 and suggests trying to source a later hand piece although hard to get.
I will contact Celestron.com as he also suggests.
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