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Did both Senior and Master with Dave. Definitely one of the greats in the sport, both personally and professionally!

Michael Shellengerger again?

One often overlooked source is the FAA Rigger Handbook. It has a section on packing mains. Available as a free download. The 'thing' that helped me the most for recognizing the line groups is the knots. A/B & C/D are easy because they go through the front & back slider grommets. But distinguishing the A & B (or C & D) from each other can be a bit challenging. Look at the knots. Each line group will have its knots at about the same level. The knots for the different groups will be at different heights.