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Had a massive and sudden spike in RA last time out that would happen every 3 minutes. Opened up the GPD2 (powered by a Skywatcher Synscan GOTO kit) and there was a dark crud in the lithium grease I use - seems some insect decided to have a look and got rather squished. I keep my mesh pretty tight, so ANY matter is going to affect it.
Cleaned it next day and all good again.
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