Loosen the jamnuts towards the center of the UCA, one side is reverse threaded (righty loosy, lefty tighty), then adjust the length of your UCA. Once it's within spec, tighten your jam nuts outward against the two ends.
Sent from the Death Star.
2012 Kona Blue 3.7L V6:
Borla LT headers, O/R h-pipe, Borla S-types, 3.73 gears,
Steeda adjustable UCA w/ mount, BMR LCAs, Airaid CAI,
LCA Relocation brackets, AE driveshaft, GT 80mm TB,
Black 18x9/10 2010 GT500 Wheels w/ Nitto NT555s,
Eibach Sportline Springs/shocks & Koni STR.T Struts