I have an old National # 7 pressure canner with the old petcock system and want to convert it to a weighted system. Has anyone done this? I see a part # 85485 regulator kit but it doesn't say if it's adjustable . Not enough info... I have seen the 3 piece weight set from 5-10-15 lbs and that's what I want but maybe they don't make it anymore and this other kit replaces it.