Kind of thinking out loud here, but I'm toying with ideas for making weighted practise poi before investing in actual fire poi. Probably going down the fill-a-tennis-ball-with-something route.
For the cords, I have some offcuts of kiteline of various strengths (none less than 100kg) but some of it is pretty thin - the thinnest, hell I think I've flossed with thicker stuff - so I'm wondering about speed and balance.
Kiteline, although very strong, is thin and light. I can happily tie it to whatever I make my poi out of (got to get some swivels tho) BUT is it a good idea?
Does cord thickness have much effect on poi speed? Anyone tried spinning with a cord of say, 1mm thickness?
Maybe I should braid it up?
Also, would I be shooting myself in the foot with regards to weight distribution, balance, momentum etc? Kiteline is very very much lighter than chain. I am guessing they'd feel very different when spinning, but I'm only guessing.
Any thoughts?

PS - I'm using juggling balls in socks for weight just now but not happy with the lack of handles - they keep slipping out of my fingers! lol