Is there a wire topping lift connected at the top of the mast? My guess would be the wire would terminat in a small block, a separate rope section tied to the end of the boom, turned back through the small block on the end of the topping lift wire, to a cheek block near the end of the boom , then forward to a cleat where the rope would be easily accessible for adjustment. this setup gives a 2/1 purchase.
Does the boom have a rigid vang...what holds it up now?
Certified...in several regards...