If you're interested Jim, here are the 2 pages that cover the throttle control installation in the Jabiru J230 construction manual. The design is probably similar to the way many Kitfox builders did it, especially before the dual cable assembly. Highwing (Lowell) had a really slick design for his, as I recall (like so many of his ideas) that there were pictures of on this forum.
That Jabiru airplane was a factory demonstrator that was then sold. Those throttles don't seem to have any locking or adjustable friction feature that's visible in the picture... must be something somewhere though, especially since those engines used a Bing carb with throttle spring..