The trade-off is between head length and angle. I would leave the tip length a constant, since the different tips I use are not avaiable in different lengths. The tips I use are: #2 for some older European pianos with tuning pins smaller than the standard modern #2 (you can tell by the sloppy feel), #3 for most tuning work, #4 for tuning the occassional repinned piano. You can also use a thin wall tip which is necessary for a few console pianos where the pins are too close together in the low tenor section. Instead, I use an insert that fits into the standard tip. The shortest head available with the most acute angle is the extra short with a 5 degree head. This works for 99% of all vertical pianos. For grands, I use an extra short with a 15 degree head. This gives the best possible control and will work for 95% of the pins. For the remaining 5%, move the hammer so the handle points towards the bridges, out of the way of the plate struts and cases parts or, in extreme cases switch to a longer head. I am envious of tuners who are ambidextrous. Plate struts are easily avoided and you reduce wear and tear on your shoulder. Carl
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