Replacement part number 20, the power buttun. It fell off day one.

Replacement part number 20, the power buttun. It fell off day one.
I need replacement for power button, part number 20. It fell off as i took the record er out of the box. I put it back on but it kept coming off. I was able to use it twice, but the third time, the button came off, it fell in the grass and i never found it.

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