That method works, but it seems like way too much work to me. Put a timing tape on your damper - or mark it at 90, 180 and 270 degrees.

-Turn the engine to #1 TDC, loosen both rockers, then tighten until all of the slack is taken out and slowly turn another half turn.

- Turn the engine 90 degrees and adjust #8 I & E

- Turn the engine to 180 degrees and adjust #4 I & E

continue 90 degrees at a time and adjust 3,6,5,7,2 - in that order.

Two rotations of the engine and you're done.