You might have gotten away with not having it. A new float arm was your best option unless you were at the track, couldn’t find a spare and you needed to get on the track. Depending where you race, the tech guy could have DQ’d you for having a modified part in the carb. If you can, purchase or borrow the new float arm Go/No Go tech tool to be sure your float arms are legal.
LAD Specialties customer / tony kart / rotax / kt100