Here's a Steigerman with a low bearing on the agraffes. Tuning it, I had the feeling the pitch was sliding quite easily. Even with long non-speaking length, I was getting pitch changes when I removed the hammer force after a slow pull. I performed a friction test. I flexed the pin towards the string, removed force, whacked, and measured. Did the same flexing away from the string. This test measures the friction at the agraffes, and the residual friction in the pinblock. Usually I get 15 - 20 cents. On this piano, it was 5 cents. This explains why the pitch so easily followed the pin. To improved tuning sensation, I might add thicker felt under the strings.