Some grand and upright piano cases have a design where one must remove a piece of the case in order to get the tuning hammer into the tuning pin of the first string, called A0, (A zero)
This can take time and slow you down.
If you have an extra tuning tip and a tip wrench, you can tune this note with ease.
Just insert the smaller size of the tip wrench into the threaded end of the tip. The smaller size is thin enough to go all the way through, past the threads and grab the star hole in the tip.
Then just put the tip on the pin and tune. The bend in the wrench will clear the interfering case part.
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