THEME: substituting S for C in common phrases changes things
GOOD ONES: Get one's kicks in a painful way? TAKE IT ON THE SHIN [not CHIN]
Principal plant? THE BIG SHILL [not CHILL --- this was tough]
Pay stub? OLA [from "payola" ---
stub suggests the suffix, or end bit]
Highest power? VETO [never thought of it that way; I was awash in the metaphysical]
Digital temperature gauge? TOE [my favorite of the year --- toe gauges or tests temperature of bath, and a toe is a digit]
Marathon unit: Abbr. BBL [another toughie until one realizes Marathon is an oil company]
Trains may stop at them ALTARS [yet another hard one: trains are bridal wear]
BTW: Ally of Sun CHAING [I wish I were on a first name basis with these historical figures of the East]
Some like 'em tough --- guess I'm one of 'em.
RATING:

Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun