Need help from someone who owns an owners manual. My manual says to use 3/16" flax for the stuffing box, but some owners of 272s say the manual is wrong and that it should be 1/4". So I'd appreciate hearing on this imprtant matter from other owners who have a manual -- I do not want to launch and then find I have installed the wrong flax. Has anyone used 3/16 on a 272?