A point of interest about buying shackles (correct me if I'm wrong anyone) is that, for a given pin size, a bow shackle has a higher Safe Working Load than a D-shackle. Being rounder they're a bit harder to store but the higher rating is worth the effort.
Also, for recovery kit, only buy shackles with ratings stamped on them - don't ever buy galvanised mild steel shackles for recovery (especially Chinese ones). The bigger the pin diameter the bigger the rating of course, but also when using shackles to attach a rope or strap to a vehicle recovery point (the only place it is appropriate to use them as they should never be able to become a missile in that situation) the bigger the pin diameter, the less stress is placed on the eye of the rope or strap because it's bent around in a bigger circle.
Excellent points, Dave, about gearboxes and strength and forward versus reverse recovery and diff stressing. Obviously these points become more important the more immobilised the invalid vehicle is and they're moot rather points when we talk about a light vehicle stuck on wet grass, but it's certainly given me food for thought.
GrahamH
'65 SIIa 88" Hard-top, Rego DW622, 186 Holden, 4.3 diffs (she's still back in NZ)
'88 4-door Rangie (long gone)
'96 Disco SI 3.9V8i (LPG) Manual (Inspector Rex's kennel)
'03 Disco SII TD5 Auto (the serious camping car)
'15 Disco 4 3.0Lt TDV6 (was a dog-hair free zone - not now!!!)
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