Thanks for the memory, I had forgotten about these gadgets but remember them plainly now ! This summer I was buying a watermelon and asked the young man is we could “plug” it. He had no idea so I said bring me a knife and he let me demonstrate. I only asked because I needed a good melon and wouldn’t have time to return it if it was underripe. He was amazed when I told him it was common practice in grocery stores years ago.