You don't indicate what year your machine is, but yes, those clamps do break. Not uncommon on older machines. They are the cheapest way to make a clamp for low pressure applications and they do break. One advantage of them is they take up less room than a worm drive clamp and you don't have to get a screwdriver into a tough location to tighten them. You can get replacements or at least I used to see them at Farm and Fleet.