Mark,
Mark,First I don't trust those loops where the lifelines attach; they look pretty flimsy. You could mount the block next to those loops,but most of the time I singlehand and this way I can trim the chute while sitting at the helm. Additionally I run the sheet under the docking cleat to take the tension off, but still being able to ease them in a blow.Phil: I have been in situations where a gust would come up and the boat would lay on its side, and the weatherhelm would overcome the rudder.; the only fix was to ease the sheet at which point the chute would flap violently which in turn would cause the sheet to load and load. The blocks have held up for three years and the rail never moved. As far as line size I must admit that I am not sure since the tack line and the sheets came with the chute. The best guess is that the tack line is the size of the main sheet and the sheets the size of the jib sheets.