I cut solid pencil lead into lengths.
Then I take a pair of wire cutters and make cuts about 1/4 apart, but not all the way through the lead.
Then I slide the lead into some parachute cord, melt the ends, poke a hole, and put in my vest.
When I get to fishin', I take one out, give it a few twists and bends, and I got me a slinky. If I don't, it's lead.
It's quick and my wife doesn't bi*ch about shot being sucked up the vacuum cleaner.