Topping Lift for Hunter 140
The "line that holds the boom up" that you asked about is called a Topping Lift. It is exactly as you described it... a line (probably 1/8th or 3/16th for the 140) is secured to an eyelet located on the side of the mast near the top. Another eyelet is located on the side of the boom near the aft end (the same side as on the mast!). The line is simply tied in place and its only purpose in life is to save your head and that of your guests when you drop the main.This line does NOT have to be released when you sail! I have a 170 and release the line from the boom whenever I sail, as it is said to extend the sail life (compared to it being connected when you sail). I don't know if this is true but it does seems to make sense as the line may cause the sail to wear as it the two rub against each other. I know nothing about the 140, but do not know why you could not do this. Approximate cost would be less than $10 for all the pieces (2 eyestraps, 4 rivets and some line). Tools would be: a 3/16th drill bit to drill the holes for the rivets, a drill and a rivet tool. I would think that it would take less than 10 minutes start to finish for this project. If you do not have an open cleat on the mast near the gooseneck to secure this extra line to when it is free from the boom, you may want to rivet one on also. Most of the time I just release my topping lift line and let it blow around in the wind. Probably a bad habit...Check out almost any daysailer and you will see examples of the topping lift...very simple, easy and cheap. Hunter uses this method on the 170, I don't know about the 146. If you have any questions, respond with a post or see the 170 at your local Hunter dealer. Any of the parts I mentioned are available at www.westmarine.com. As was also recommended, a boom kicker, this is what they are made to do. More expensive and probably over kill on a 140, but a good recommendation.One last thing. If you install a topping lift, it does not matter how high (or low) you tie up the boom, if it is released when you sail. If you leave it tied on while the main is raised, which will usually be the state, ensure that the main "picks up the boom" when you raise the mainsail. You want it longer, not shorter (i.e. the boom is lower that it needs to be when the main is down). You will notice as you raise the main, that when the main sail is almost all the way up, it will stop raising and feel as if it is stuck. Have someone lift up the aft part of the boom (and hold it up as you finish raising the main) and you will notice that the main will now raise the rest of the way very easily. This is such as the boom is pulling on the leach (the rear edge)of the sail and causing tension versus the tension coming from the luff (the forward edge of the sail). You probably notice this every time you raise the sail now. This is why it occassionally (sp) gets "stuck" now when you raise it.Good Luck. For my own information, please keep me posted on what you did and how it worked out.Rusty