I am having a problem with the clutch cable coming loose at the clutch fork.The bolt that holds the cable to the fork keeps coming loose and makes it hard to shift gears after it gets really loose.The first gear to get hard to shift is reverse.What may cause this.I bought the car used and noticed that the previous owner installed a billiet quadrent but looks like a stock cable with no firewall adjuster.How tight should I make that cable at the fork?Also would this cause the poop performance at the track??Thanks for the help.