The surf world lost a gem this week when Glen De Witt, the longtime owner and guiding force behind Rainbow Fin Co., suddenly passed. Much-loved, he spent decades making the fins that quietly shaped how generations of surfers rode waves. The De Witt family announced Glen’s passing on August 12. A Life Built Around Surfing For more than half a century, Rainbow Fin Co. was much more than a fin manufacturer. It was a living link to surfing’s past, and Glen De Witt was one of the people who kept that connection alive. Rainbow Fin Co. traces its roots to 1968, when a group of young Santa Cruz surfers began building fins to supply the growing surf industry. Over the decades, the company evolved along with surfing, producing everything from early shortboard fins during the twin-fin revolution to longboard templates that became synonymous with the classic single-fin experience.…