On most of my blocks I have replaced the shackle pivot pin with a grade 8 bolt, hardened washers, and nylon lock nut. I also use a molly instead of a pin on the latch side.
Bushed sheaves are no problem unless you have high speed rigging. Not likely with a tractor,eh? A 10" A-10 Skookum runs about $1,000.00. Both of mine cost me $75.00.
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