The cruise control isn't operable at speeds below 30MPH, IIRC.
with the broken stop to the sheath/housing the cruise should still operate fine... just a bit roughly as BT mentioned. If the sheath were slit lengthwise it'd be another story.
The cruise system is far from simple in modern cars. For future reference, things to start with are: CC throttle cable, speedo cable, speed sensor signal, vacuum leaks or improper routing, bad clutch switch, brake switch and brake fluid level.
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