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Re: Have You Seen A Mainsheet System Set-up This Way?
That looks like a German mainsheet, but the ones I have used also needed a separate traveler to adjust the sail's angle of attack. Also, the ones I have used needed a second pair of winches to adjust the mainsheet. The need for two extra winches would make a conversion to a German mainsheet system expensive.
As I recall, the Catalina 27 originally had an end boom mainsheet, which was attached to a traveler car. The traveler car ran on either a rod that was attached to the transom, or it was attached to a t track on the transom. (I don't remember for sure which it was.) If that rod or track is still there, it shouldn't be too difficult to revert to the original system. You might even find the original blocks in a drawer somewhere.
A lot of people don't like an end boom mainsheet and transom mounted traveler, so they changed them. I had that arrangement on a boat similar to the C27, and liked it after I got used to it.