How many times has it happened to you that the line on your casting reel slips away and you have to pass it back through the eyelet of the reel to be able to thread it back into the rod? This simple little stopper stops your line ensuring it doesn't get back on the spool while you set up your rods. tested on 0.14 braided line.
from the project I created a space of tolerance to prevent it from being tightened too much risking ruining it and at the same time to guarantee an excellent grip....
in the mouth of the big....