Scope: Terminal Tackle = the hardware tied at the end of a fishing line — hooks, sinkers/weights, swivels & snaps, floats/bobbers, and leaders — per Wikipedia's "Fishing tackle" definition; excludes rods/reels, storage/tools, and nets (sibling catalog leaves) and excludes lures/baits, which that same source lists as a separate tackle category from terminal tackle itself.

Seed: (1) equivalent of "weave not thread count": hook size (the number listings lead with) is the generic trap — point style and wire gauge are what actually decide hook-set and bait-holding, and for sinkers it's material (lead vs. tungsten) that decides sensitivity and legality, not just the oz number. (2) A sommelier-minded buyer would notice that wire gauge and the forging/tempering process behind a hook (not the stamped size number) is the real quality signal — process over label, same as terroir over vintage year.

Sources:
[wiki_fish_hook] https://en.wikipedia.org/wiki/Fish_hook — anatomy (eye/shank/bend/barb/point/gap/bite), sizing scale 32–1 then 1/0–20/0, wire gauge & shank length & single/double/treble — fetched excerpt
[wiki_fishing_sinker] https://en.wikipedia.org/wiki/Fishing_sinker — shapes, lead bans (UK <1oz, US/Canada national parks, some US states), tungsten ~2x density, deep-drop 1–14 lb — fetched excerpt
[wiki_fishing_tackle] https://en.wikipedia.org/wiki/Fishing_tackle — terminal tackle definition (hooks/leaders/floats/sinkers/swivels/snaps/split rings), swivel sinker purpose, fluorocarbon least-visible — fetched excerpt
[wiki_circle_hook] https://en.wikipedia.org/wiki/Circle_hook — circle hook mouth-corner hooking vs J-hook gut-hooking, citing Cooke & Suski 2004 — fetched excerpt
[wiki_tungsten] https://en.wikipedia.org/wiki/Tungsten — density 19.254 g/cm³ — fetched excerpt (infobox)
[wiki_lead] https://en.wikipedia.org/wiki/Lead — density 11.348 g/cm³ — fetched excerpt (infobox)
[eagleclaw_hook_sizes] https://blog.eagleclaw.com/fishing-made-simple/understanding-hook-sizes — confirms 32→1 then 1/0→19/0 sizing direction — fetched excerpt
[eagleclaw_barrel_swivel] https://eagleclaw.com/products/eagle-claw-barrel-swivel-with-safety-snap — brass barrel swivel size 16 = 8 lb test, combined swivel+snap product form — fetched excerpt (spec table)
[eagleclaw_bb_swivel] https://eagleclaw.com/products/eagle-claw-ball-bearing-swivels-with-coastlock-snaps — ball-bearing swivel size 0 = 15 lb test — fetched excerpt (spec table)
[eagleclaw_heavy_swivel] https://eagleclaw.com/products/lazer-sharp-heavy-saltwater-swivel — heavy saltwater swivel size 4 = 300 lb test — fetched excerpt (spec table)
[eagleclaw_egg_sinker] https://eagleclaw.com/products/eagle-claw-egg-sinkers — weight sizes 1/8 oz to 8 oz — fetched excerpt (variant list)
[eagleclaw_floats_collection] https://eagleclaw.com/collections/floats — slip/fixed-spring/snap-on/pencil/round float style set — fetched link list
[berkley_vanish_leader] https://www.berkley-fishing.com/collections/leaders/products/vanish-fluorocarbon-leader-material-1285541 — fluorocarbon leader 4–50 lb test — fetched excerpt
[berkley_steelon_leader] https://www.berkley-fishing.com/collections/leaders/products/steelon-wire-wound-leaders-1285570 — wire-wound leader 20/30/45 lb test — fetched excerpt

Branches: tackle_type → saltwater leg of primary_water (then_ask hook_material_finish/swivel_type/leader_material) supported by eagleclaw_heavy_swivel being explicitly marketed for saltwater and wiki_fish_hook noting corrosion-resistant finishes exist; tackle_type's five legs each route to that type's own facet set, supported by wiki_fishing_tackle's enumeration of hooks/sinkers/swivels/floats/leaders as distinct terminal-tackle pieces.

Noise: WebSearch exhausted for this session (budget used); worked entirely from curl fetches of Wikipedia, Eagle Claw, and Berkley pages, plus Internet Archive-style direct brand URLs that resolved. Mustad.com, Sampo, VMC, and American Fishing Wire's detailed spec tables either blocked (403) or rendered JS-only content that curl couldn't extract, so swivel/leader numbers are sourced to Eagle Claw and Berkley instead — both are real spec-sheet pages with fetched numeric tables. No NOAA/regulator page on circle-hook mandates was reachable (tried several guessed URLs, all 404'd); the circle-hook conservation claim is single-sourced to Wikipedia's Circle hook article, which itself cites one peer-reviewed review — flagged as medium-confidence in judgements rather than treated as two-sourced. Split rings and float buoyancy-in-grams ratings were left out as separate facets (rolled into swivel_snap_combo and float_style respectively) to stay inside the 12–20 facet budget; eye type (ringed/needle/spade) was left out as a facet since no spec sheet row needed it beyond what hook_point_style already implies. Color (sinker paint finish, e.g. "Unpainted," "Chartreuse Glitter," "Pink" on the egg-sinker spec grid) is left out as a facet: it appears on only one brand's spec sheet, reads as a cosmetic/attractant choice rather than a performance spec, and has no analogue on the hook/swivel/float/leader sides. Package Quantity (count per pack, on both the swivel and sinker spec grids) is left out as a facet because it is a commerce attribute like price, not an expertise judgement — bigger packs don't change how the piece fishes.

Corrections (2026-10-26):
- Added `swivel_material_finish` facet (brass/black_plated/red_plated/stainless_steel) and routed it into `primary_water`'s saltwater branch and `tackle_type`'s swivel_snap branch; `swivel_type` is a rotation mechanism, not a corrosion-relevant material, so it was the wrong facet for that branch. Cited to eagleclaw_barrel_swivel's "multiple plated finishes" Key Features line and a new reference, eagleclaw_plain_barrel_swivel, confirming the Finish/Plating variant (brass/black) and a stainless-steel SKU on the same site.
- Added vocabulary entries for octopus, baitholder, offset_worm (hook_point_style values), crane and "dropper" (swivel_type), bank (sinker_shape), and waggler (float_style), all used in facet values/definitions with no plain-English explanation anywhere.
- Noted the hook_size top-end brand discrepancy in the facet definition itself (Eagle Claw's own chart tops at 19/0 vs. Wikipedia's 20/0) instead of silently bucketing to 20/0.
- Reclassified `swivel_rated_strength`, `leader_test_strength`, and `sinker_attachment` from `source: listing` to `researched` (backfill_cost low): this run's and the prior run's only confirmed evidence for these three is a brand-site spec grid, not a generic retail listing.
- Logged "Color" (sinker paint finish) and "Package Quantity" in Noise above with a reason for leaving each out, since both are real spec-sheet rows the register was dropping without comment.
- Rejected: the checker's Part A #1/#3 overlap and Part F lead-toxicity-standard note are the same underlying issue (no single regulator named) already covered by the hook_size definition fix and judgements' existing medium-confidence flag; no separate change made for the lead-toxicity softer finding since the checker itself called it a judgement call, not a required fix.