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R1DER said..Manuel7 said..PVC pipe or inner tube.
Dude that's a lot of thought gone in too inner tubes!
What about using a 10cm section of inner tube as a sleeve to cover the middle join in the mast to stop sand getting in, instead of duct tape around the join ?
That's what Ben Profit suggested! Personally, I watch my extension and mast ends before assembling.
Otherwise, sand the mast sleeve down for a sightly looser fit.
Watch for sand inside sail sleeve too.
PS: Will switch to PVC tube on boom. Thickens diameter so lines don't swing and don't wear out as quickly. Even tube wears out and gets bunched up.