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Tighten the nuts firmly on the two bolts. C0420-00-01 1 Updated: 8/23/07 #4200-4900 Toilet Support Instructions Rev. B Step 3: Attach the Support Back For use, slide the support back over the two upright posts on the base plate. When the back height is where you would like it, tighten the plastic locking knobs. To open the safety buckle, squeeze the top and bottom tabs together. When not in use, remove the support back by loosening the plastic locking knobs and sliding the back off the p