If you set it at zero backlash and tighten the opposing adjuster you will preload the carrier and set the back lash at the same time. I made a spanner from an 1 1/2'x3/4" angle piece of steel. Drilled two 1/4" holes at the correct spread for the adjuster holes. Two 1/4" bolts and nuts and your all set. The bolts will fit in the adjuster holes.
Doug