Used to make sinkers like that called “ slinky’s” just bought parachute cord cut a few inches pull center filling out seal one end by using a lighter or Match filled them with #8 lead shot heat sealed other end and ad a swivel
My wife likes to use worm harnesses with bottom bouncers, but we do it a little differently than some. I wouldn't call it "trolling" per say. We don't leave the rod in a holder like trolling. This is in the speed range from .8 to 1.4 mph. We jig the rod making light contact with the bottom on the down pause. I think the fish bite on the down swing and the rod loads up on the upswing. When the water is cooler like now the slow presentation works for us. Also, a slow death hook can be irresistible at certain times. If you want to add a dead stick or two use a longer noodle rod, as they are slow to load up and we don't miss as many bites.
In-line if you aren’t near the bottom.Bottom bouncer if you are.Simple