Throw them and fit new ones.
Be warned that some of the cheap ones out there are cheap,.... as in crap.
I've had a couple of sets that the adjuster fell out of.
Pre-94 ones are NOT adjustable, but ya can fit post-94 ones to pre-94s.
The levers are standard and fit a whole raft of Kawasakis (ZX6, 9, 11 for starters) as well as the C10.