Hi Leon,
I once used a Nissan stubaxle I brought from an auto wreacker for the RA portion of an EQ mount. The scope, (10 inch Dob), was held in place in a steel fork mount and this was attached to the stubaxle. I tested the mount and it could handle well in excess of 40 kgs. This mount was used for visual use. I did, however have a motor drive for slewing only.
Good luck with your search!
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