Cal-34 boom question

[Bayou Sailor]

I recently acquired a 1969 Cal-34 named Margarita. I mentioned to my wife that she is a "69" named Margarita and this was divine intervention. She kinda laughed at me and said "why not". Margarita has been a bit neglected over the past couple of years, but not abused. Fuel needed attention and a carb kit and now the A4 purrs like a kitten. I have some more work to do but she in in sound condition. If anyone has experience with the boom set up on the early model Cal-34 I could use some help. There is something missing on the outhaul. Anyone familiar with this? It seems that a wire that should run thru the boom is gone and I cant tell what kind of setup is supposed to be there to increase or decrease mainsail tension. Any info????