New clutch cable or just adjustment?

I've searched for this but been unable to find out whether or not I should do this, but have found how to.

My clutch cable is now so loose that the adjustment knobs on the lever do nothing. Is this a sign that I need to replace the cable completely or can I just tighten it up at the other end inside the bike?

Big thanks in advance!

BTW, it's a pointy K4 if that makes any difference.

[Sid Squid]

Do this:

Originally Posted by Me, many times.

Slacken off cable adjusters at top and bottom, loosen lifter locknut, back out screw a bit, ensure that lifter arm is as far down as it will go, gently turn screw in until it contacts pushrod, back it out a bit, (~1/8th of a turn), then nip up the locknut, roughly adjust cable with lower adjuster - not too tight - then with top adjuster ensure that there remains a little slack all the way from lock to lock.

If that fails to improve matters then something, pssibly the lifter, is duffed.