Yes, Christian, you have it correct. The topping lift is a double-line around the sheave, but only because of the Dutchman sail-flaking system. The double-line allows vertical/horizontal adjustment of the Dutchman filament lines. The double-line portion of the topping lift has a fixed length, so topping lift adjustment is still done by the in-boom mechanism.Kenneth, your T.L. is a double line? On my '85 I think the purchase was inside the boom. Perhaps I misunderstand the photo.