MYTH:
You must use the same hammer technique on all pins.
FALSE
A piano note has different non-speaking lengths (NSL). That's why you often have to use a slightly different technique for long and short NSL. Read on to find out why.
When we turn the tuning pin, we are twisting it and bending it.
When we remove the hammer force, the tuning pin unbends and untwists. This changes the NSL length.
But short and long NSL tension do not react the same way to this similar unbending/untwisting that happens on all pins tuned with the same hammer technique.
We may need to change our hammer technique depending on NSL length.
This is due to something called Hooke's Law.
