Many one design boats have used travelers that can be pulled to windward in light air and released to leeward in heavy air. Most Jet 14 main sails today are designed so that they are vang-sheeted and windward adjustment of the traveler is not required.
The traveler design below allows you to release the mainsail to leeward of center, effectively decreasing the wind angle on the main. In this case, it is used primarily in heavy winds when tightening the mainsheet in further will only cause the boat to heel more. The traveler is usually the last control used to de-power the boat and should not be used unless there are at least 15 knots of wind.
Talk to your sail maker to verify if windward traveler control is required for your sail cut. If not, this design is simple and effective.