[Rhodes22-list] Question about rigging

[From the Puentes]

Dear Rhodes Community: We bought our Rhodes new in 1991, used it once and moved out of the country (China and Japan). The boat was wrapped and stored in a marina. We just came back and unwrapped it, rigged it and relaunched it (actually our first launch, as when we just got it, was delivered), so we never had the opportunity to put it together until now. It took us a few hours to figure out how all went together, but finally did it. Except for one problem: we cannot figure out how does the main sail gets rigged.  We have a self furling innermast sail. The boom is in place and held by the boom vang (I hope I am using the right terminology). Then there is a 3/8 line attached to a block at the end of the boom with 2 additional blocks. How is the sail rigged to the boom? 

Any help explaining this would be greatly apreciated.

Regads and thank you,

Pat