It is possible to make fishing jigs without expensive moulds - read about one method for doing so here with lots of pictures.

Bagley Bait Co.

Make jigs of any weight with lead and aluminium using the same

Jig Molds: The Best Molds For Making Amazing Jigs

TETRA WORKS DUO

THE GREATEST STEELHEAD LURE EVER – Salmon & Steelhead Journal

Fishing Monthly Magazine December 2021 by Fishing Monthly - Issuu

Как привязать два крючка чтоб они не путались 3 способа

How to Choose the Right Jighead for Crappie Fishing

Make a Sticking board – Journeyman's Journal

Going Artificial. Leave the Live Bait Behind. - Berkley® Fishing US

Do you put weights on bass lures? - Quora