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Thanks for the suggestions guys! I'll definitely try the copper tape idea.
I've currently been going out and spraying a VERY STRONG surface spray on the tripod legs every few days, though that will get expensive in the long run. We are getting on average 50mm of rain a week at the moment, so the ants are certainly looking for somewhere to go, and the rain washes the surface spray away a bit too...
I've brought the rig inside again recently, as I just don't want to risk it during the wetter months, and I can usually get a < 4 arcmin polar alignment sorted in about 20 minutes, so I'm not too concerned about it at this stage... During the cooler, drier months I'll find a good permanent location for the mount and hopefully get a lot more imaging time in as a result...
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