Sometimes one connects the Nylon line to the speargun, sling or pneumatic, directly using a sleeve.

A pity, since if one wants to disconnect the Nylon line, for example to connect it to the dyneema line of a newly mounted reel, he necessarily has to cut the Nylon and use a new sleeve. It is then better to use a piece of line to make a ring on which to connect the Nylon with the sleeve. In the photo a possible, even if not perfectly neat, example.