Rig tying jig
Holds hook and line under tension while you tie, so the job takes two hands instead of three.
The problem
Tying rigs in a swell with cold fingers is awkward. The hook slips, the line goes slack, and the knot ends up poor exactly when it matters.
The fix
The jig has a spring-loaded block that holds the hook bend, and a spool with a friction brake for the line. It bolts to a bench or clamps onto the edge of a crate.
The next version gets a scale along the side, so rigs come out the same length without measuring every time.
More ideas
A hook guard that actually stays on
A soft TPU clip that snaps over treble hooks and jigs so they stop catching nets, clothing and fingers.
A rod holder that fits your rail
A parametric holder printed for the exact tube diameter your boat has — not a standard no boat actually follows.
Gear tags for nets and pots that last
Name, phone number and registration embossed into the tag itself — not written in marker that vanishes in three weeks.