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My apologies for the very late reply and thank you for your input Robin, Ken, Peter and Bojan. You are all correct - I have taken more care to balance the RA axis accurately and have had great results. I have also put in pulleys and a timing belt and completed a small 2 cycle test and the pk to pk is about 8.2 arcsecs. If I apply a PE curve it will be down to approximately 3 arcsecs pk to pk so happy days.
Thanks again.
Lucas
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