Exploring the Principles of Rigging - Training and Workshops for Arborists | ACRT Arborist Training
DMM Impact XS Pulley Block - Lowering & Rigging from Gustharts UK
Frictional properties of arborist rigging blocks - ScienceDirect
Arborist Blocks and Pulleys for Tree Rigging - TreeStuff.com - YouTube
Tree Rigging Information and overview of Negative Blocking and High Line Advantage from WesSpur Tree Equipment A… | Tree climbing equipment, Arborist, Tree surgeons