Hi Eden,
I have a Losmandy side by side mounted on my original EQ6 Pro and it suffered the cone error issue to start with.
It has plenty of screw length so I took the saddle clamp and milled a small amount off the top to allow it to fit into the dove tail neatly and this prevented the tilting when the clamp was tightened.
I recently checked for cone error after mounting a new camera setup, I have an ED80 and a GSO RC8 on the mount and over 180 deg of rotation of the RA axis it never moved off target.
That's all I needed to do to mine.
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