I have a line made fast to a hook that is attached to the boom. The line goes through a block and fastens to a cleat on the side of the boom. The block is attached through the eye of steel line leading up to the mast. I can, and did so on my last sail, undo the hook once the sail is holding the boom, and fasten it to a point on the mast. Of course, I must remember to put it back in place before dropping the sail. Alternatively I could loosen the line and hope the wind just blows the line clear of the sail leech. Either way, it looks like I would need to make adjustments to the topping when raising the sail.