[quote=shortyfox]You can certainly reinforce the area of the tramp around the jib blocks to take the load. The problem is the tramp is flexible and no matter how tight you can get it; it will lift up some during a puff and come back down when it slacks a little. You will have to constantly be sheeting in and out to sail efficiently. Does the 21 have rails? If it does, you can have a cable or line running underneath the tramp, secured to each hull with a backup bar. Make it super tight because this will be taking the load. On your tramp, directly over this wire or line, have big stainless grommets installed with reinforcing material. Attach your jib blocks through the grommet with a long d-shackle. You'll probably want to be inboard at least a foot from your current ideal fore and aft position of your jib blocks. This set up works best with a barberhauler because you will want to move the jib sheets outboard from time to time when you're off the wind. We'll get into that later because this is all moot if you don't have a way secure that line under the tramp that will take the load.
What Dogboy suggested could be a good option. Take it a step further, and in about the middle 3 feet of that line or wire have a piece of line with a 2 or 3 purchase using a fiddle block. You can open and close the slot. Once again, you'll have to really secure a pad-eye mounted where your jib blocks would normally be fore and aft.[/quote]
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