Small component part of the setting of the speargun, the sleeve is key for the resistance of the line once the fish is caught.

The sleeve can be mounted using specific pliers, but not all ways of tightening the sleeve are correct. Let us see a good method. Practically, one has to tighten the sleeve on the side where the line ends, while central part is untouched to leave an unloaded area for the Nylon line. Finally, the last part of the sleeve is tightened, but edges must be left slightly open to correctly follow the line, without squeezing it and having the edges of the sleeve to eventually cut it.