Just a trick I do ....
When I insert the ball of the string into the pin-hole, I thread it in fairly deep. At least a couple of inches. Then, as allthumbs says, I press the pin down with my thumb and pull up on the string at the same time. This locks the ball into the pin and helps keep it from popping up while tuning up. It's not an uncommon thing.
Les
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Respect The Music
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