I use danville waxed 210 denier for chenille body jigs ,and 70 denier or 6/0 for thread necks , the 70 is alot thinner and doesn't build up as much . but it will breack alot easyr to solve this i have bobins just for the 70 that are set to grip the spool lighter .only use those bobbins with the 70,I have 10 bobbins total so I don't have to change for colors or sizes all the time