Enchanted Strings: Bob Baker Marionette Theater – The Library Store
Plumb Bob with String - Anza
Ravin String & Cables Set - R26/R26X/R5X - Al & Bob's Sports
2 PCS Plumb Bob Magnetic - 10.7 oz(305g) Plumb Rite With 14.5 ft(4.5m) String,Line Reel Used in De Construction Can Automatically Stretch the Line and Quickly Stabilize the Plumb Bobs - - Amazon.com