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If you take most of the weight by lifting the counterweights when raising the altitude, the original alt bolt will last the lifetime of the mount. It is not reasonable to expect a budget quality bolt to raise the mount unaided when
operating adjacent to the mount's pivot point, against the huge leverage of
the counterweights out near or at the end of their shaft. I haven't done any
measurements, but your 10kg load probably equates to a 70-80kg load
on the bolt, plus the not insignificant resistance when the end of the bolt
grinds on the mount as it rotates. I had 13kg on my HEQ5, and when I sold it after 7yrs the bolt was still fine.
raymo
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