btw, I was assuming basically a solid metal rod from servo to surface. There are tons of other types of pushrods or linkages that don't have the "other end" problem.

"Old fasion" (but very effective) wood pushrods with metal rods attached to each end. You can have a threaded section at each end easily.

Plastic flex rods, you can thread in to the plastic. If the rod gets close enough to your surface or servo, you can actually use all-thread, and have no exposed rod, just a clevis directly touching the flex rod. Or you can do the "rod inside" trick, but sliding the non-threaded part inside the nylon until the threads grab.

Pull-pull arrangements usually result in a clevis or ball link at both ends.

I'm sure I'm forgetting more than I'm including.