The Proctor 2C turnbuckle might be a good solution. The overall length of the turnbuckle is just under 1 inch, leaving about 1 inch for the crimp and loop at the end of the cable and for the travel needed in operation. I had looked at Proctor hardware for rigging but decided it was too pricey for me on this project. It hadn't occurred to me that I could perhaps use the turnbuckles on the control system, which needs far fewer of them.

Thanks for the suggestion.