Originally Posted by MedSailor
Hmmm.... Good point. I don't have a boom jack, but I do have a topping lift that I rarely adjust. When I put a reef in I have to let out a bunch of mainsheet and then as I pull the reefing line in the end of the boom lifts up to meet the new clew.
The only reason I can see the boom raising to meet the new clew is if there is not enough sail down aft. You have a two line system? If it is a single line It can be that the system is not balanced regarding the amount of sail aft and forward.
On boats without a boom-jack strong enough I use a top lifting not to let the boom too much down and then for the final stage I do the fine adjustment bringing the boom down (with the mainsheet) while I let go bit by bit a little more reef line till I have the boom on the correct position and a sail with a good shape. That way is the boom that is pulling the clew and not otherwise. I always reef with the boat near the wind. But I guess this depends on the boat and system