please help UCA problem

You use the smaller one to back off the top collar. Then you use the bigger one to crank down on the bigger collar and that will push your coils down putting "preload" on them. Becareful of how much preload you throw down. That will make your ride more harsh. Also watch your CV angles. Then once you get to the desired height crank the smaller coller back down against the big one. Make sure you take all the weight off of the suspension first. Then get it aligned.