Step 4:
Tune: G35 C40. Count 6 in 7 seconds.
 Test: Listen to A37-C40. It should be at least 11pbs.
This is an unofficial test, not strictly needed. It will give you an indication that the fourths tuned so far have been correctly set on the sharp side of pure. If A-C sounds slow, then one or more of the fourths is flat.
Step 5:
Tune: C40 F33. Count 4 in 7 seconds, with count one on impact.
 Test: F33-A37, theoretically 7bps, or 35 beats in 5 seconds.
Step 6:
Tune: F33 A#38. Count 5 in 7 seconds.
 Test: A#38—D42, 9bps, theoretically 9.25 beats per second, in practice 9bps or slower.
9 - 9.25bps may be too fast to count, but it should be faster than the other set third, F33-A37. Try counting 45 in 5 seconds.
Compare
F33—A37 (~7 bps), F33—D42 (~8 bps), and A#38—D42 (~9 bps).
Step 7:
Tune: A#38 D#43. Count 7+ in 7 seconds.
 Test: None yet. This note is ‘insecure’ until the next four notes are tuned.
Step 8:
Tune: D#43 G#36. Count 5 in 7 seconds.
 Test: G#36-C40, theoretically 8.24 beats per second, in practice 8bps.
Note—. It should fit between the other set thirds, F33-A37 and A#38-D42. Compare
  F33-A37 (~7 bps), G#36-C40 (~8 bps), and A#38-D42 (~9 bps).