Quick and dirty trigger replacement for MTD string trimmer, part number 753-06791.
Should also fit Troy-Bilt, Cub-Cadet, Craftsman, Bolens, Remington, Ryobi, Yardman, Yard-Machine, White, and Huskee.

Might need some minor tweaking where the throttle cable goes in and the overall thickness may need some sanding to operate smoothly, but it worked for me as a quick replacement.