A liner system, adapted for use with a rock crusher having a support bowl and a concave ring. The liner system comprises a collet that is adapted to apply a force to the concave ring and a collet adjuster that is adapted to lower and raise the collet, in the preferred liner system, the concave ring is removably retained in the support bowl of the rock crusher by the liner system. A method for adjusting a collet comprising providing such a liner system and adjusting the collet adjuster so as to removably retain the concave ring.