Well, parachute chord is just a name for the type of chord. And braided Dacron is a type of fishing line that's actually braided. Good tackle shops sell it. The parachute chord (sometimes called accessory chord) can be found in most rock climbing shops ...
Otherwise just use a DECENT monofilament nylon line with a HIGH breaking strength. Remember that this line will be sealed inside the tube, iow airtight / watertight etc. You can also make your end loops out of something else - like cable etc. Just make sure the joins are GOOD .......
All the puctuation is 'cause I've broken one of these lines before .... +- 60kg yellowfin Tunny just broke a perfectly good 50 meter line ..... bloody expensive excersize ....
Lost spear: $10
Lost line: $30
Educational purposes of my swearing afterwards: Priceless ....
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When life hands you lemons - grab the salt and pass the Tequila, baby!!!
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