Hi Steve. In regards to lubrication you need to take care as the wrong grease can melt and get onto your optics. I use a product made by Star brite. Marine White PTFE Lubricant. It will operate from -68f to +650f. You can purchase it from Whitworths Marine at Port Adelaide for $9.95. It is fine on painted, plastic and all metal surfaces... Really good gear..
Regards
Mardy
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