hi ..i have never seen a wing nut with the plastic stop material in them.. wing nuts are meant to be put on and taken off easily , by hand. I seriously doubt wing nuts with plastic stops in them exist ...better to go the washer/lock washer/ wing nut route. the elastic stop nuts are meant to be put on and not removed and not come loose under vibration, such as in machinery and aeronautics.
Hardshell Kayak Sail Rigs
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