What sort of tops'l? Laced/hooped to the topmast, or simply set from deck with a tackline? Yarded or not?
The weathered block on the tops'l sheet is likely the one usually found lashed at the gaff jaws; the sheet runs from the sail clew, through the gaff-end cheek block, along the gaff, through that lashed-on block, and down to deck.
John Leather's Gaff Rig Handbook is about the best reference I could reccomend; I haven't encountered many problems that didn't have answers somewhere in it's pages.
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