Apparatus for extending process kit components lifetimes are disclosed. In some embodiments, a process kit includes: a first ring having an inner wall defining an inner diameter, an outer wall defining an outer diameter, an upper surface between the inner wall and the outer wall, and an opposing lower surface between the inner wall and the outer wall, wherein a first portion of the upper surface proximate the inner wall is concave, and wherein a second portion of the upper surface extends horizontally away from the first portion; and a second ring having an upper surface and an opposing lower surface, wherein a first portion of the lower surface is configured to rest upon the second portion of the first ring, wherein a second portion of the lower surface is convex and extends into but does not touch the concave first portion of the upper surface of the first ring.