Hi,
Plastic tip of my brand new mast got separated after using it for a week, it was really annoying to take the tip out of the sail after each session. Now I applied some silicone and its ok.
But before that, I realized top half of the mast was really heavy, i could hear the water in it but water stayed there even when i shook it, something was blocking inside. Then i put a garden hose inside, with a little pressure a 5cm cylinder of white sponge came out.
What is this sponge for and is it any problem to take it out?

Thanks