Same way I did it but you don't need to go to TDC. Were you worried about bumping the valve down and losing enough air that it drops too far to get ahold of it? I guess that could happen. Those are good seals, I installed them when I did my dual springs.I went with the viton seals. I brought each cylinder up to TDC and used the spark plug end of my compression tester hooked up to my air compressor.