Emergency help w/bilsteins

Helping my brother put new bilsteins up front on his truck. He wants me set to 2.5 but the spring compressor won't give us enough room to put the bolt back on top with the fat rubber washer. Do you really need that washer?

 

Yes, you need that washer.

Why not use the better method for springs?
https://www.youtube.com/watch?v=5E6u7dC7EHg

 

I need to compress the spring not decompress it. We need it to be compressed enough to put all the washers and the bolt back on with the shock set at 2.5.

 

Crap, I posted the wrong part.
Part 2 has the "how to" on install without a compressor.
https://www.youtube.com/watch?v=jo0FJSi-KYs#t=144