John:
I sail a P19 with a roller furled jib without battens for recreation and the standard setup for racing. Last year there was a thread on the old forum that mentioned that the Harken Hi-load drum (Murrays #28-0165) was too small for 20' boats and could come apart under load. The old catalog also said not recommended for such boats. I do use it and like the way it works. I ordered the upper forestay with swivel from Murrays at the same time. Still, my mast is raked farther back with the old forestay, and that jib has battens, so it is faster in race mode. Just something to be cautious about. Good luck!