During ths topic I have been using a Keyes Impact Hammer with an adjustable sliding weight to alter the impact leverage . Most times I have used the weight at the end of the shaft. In the treble section the shorter strings can be tuned with the weight much nearer the pin . The most difficult note I had was the G5 . When I had done a large number of rotations (about 120 ? ) that note was still being stubborn. The weight would be at maximum distance from the pin and with the normal gentle twist there would be no movement. It was not as rigid as before but I gave two of the pins an extra 40 rotations .I think that tots up to 160 rotations . They still gave quiet squealing sounds at first . Now the G5 can be tuned with the gentle twisting movement on the lever, weight at the half mast position , and the action fits in with the other treble notes . Even the vertical pulling action for these trebles alters the tuning very quickly . I always do the final "twist "on the lever to tune down to the note ( or near the note ) and finally sometimes a very slight pull to the right frequency. As with twisting the pulling is always downwards and never upwards at the end.
It took a long time to get the nerve to work out this method.
Last edited by Jt2nd; 04/06/19 04:02 PM. Reason: Small extra detail ,for clarity .