i just noticed today that when i push my clutch pedal in all the way, i can hear the clutch still spinning. its like a smooth surface rub sound (sorry only way i can describe it). also i noticed lately that sometimes i have to use a little more effort to shift into each gear. but when i get it into gear, it does not slip out. could this mean that i need to adjust my clutch cable, or that the cable has stretched? much help with this problem will be greatly appreciated.