Topping lift would usually be attached to the outer end of the boom with a shackle through an eye on the boom. It then leads up to the top of the mast, through a sheave there and back down to the bast of the mast where it would terminate unless it is led back to the cockpit. Pretty simple.
If you once had a cheek block near the end of the boom it was probably for a slab reefing system, not a topping lift.
Life's Short ... Eat Dessert First!
La Nostra - CSY 44
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Located Southern Caribbean