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what would I need to keep them out? I know it is going to cost some $ but I want to do it right.
The setup that I remember seeing a lot (before the integrated traveler systems) was one basic Harken cheek block (Bullet block or Micro) riveted to each corner casting in line with the jib travelers. Then a basic Lance cleat mounted to the front crossbar on either side. The traveler line ties off at the jib block (traveler) goes through the cheek block, through the Lance cleat, and ties off on the opposite shroud. Pull the line and cleat to hold the jib traveler out, bungee between the two jib travelers pulls them inboard when the cleat is released.
With your current system, if you tie the traveler line and bungee under the stopper pin on your jib block, it will hold the pin up to keep it from engaging the traveler track stops.
I would guess that the whole system (cheek blocks, lance cleats, line and bungee) would cost somewhere around $50.
Or, if you replace your jib block with one that has the cleat built in to it, you can use the swivel cleat already mounted to the front crossbar as your traveler line cleat (in place of the Lance cleats). But the overall system will probably be more expensive (I would guess new jib cleats are not cheap).
If you're otherwise happy with your current set-up, I'd probably say just go with the lance cleats.
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