The reading
The bead. The book hands the reader the boy's dream of being free of every adult restraint — school, church, work, obedience — without ever having to pay the bill for it.
Engines
- unleashing · content · spine · ~ — The respectable boys are held back by their own training and their elders' orders; the payout is license. Huck is the engine made flesh: "he did not have to go to school or to church, or call any being master or obey anybody; he could go fishing or swimming when and where he chose," and so "everything that goes to make life precious that boy had. So thought every harassed, hampered, respectable boy in St. Petersburg." Tom's own arc — whitewashing turned to play, hooky, the pirate island — is the same constraint thrown off into license.
The bundle. A faint also-run of belonging (the village reclaiming its lost boys) but the dominant payout is the loosed leash, not the place at the table.
Dual-use read. Unleashing's counterfeit is impunity — license that leaves real wreckage behind. Tom flirts with it but the book pulls back: the truancy is benign, Injun Joe's actual lawlessness is the dark pole the boys are measured against. Bright-pole unleashing.
Verdict. The purest boyhood-license engine in the canon — confirmed spine.
Evidence. ~ reviewed — Project Gutenberg #74; slot quotes confirmed against the text.