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In our daily life, we always encounter a similar situation that the slug is to tight to pull out and we have to use all our strength to take it. But now, we design this very special patch board to help us solve this problem. The idea of this patch board generated from the button of the ball-point pen.When the slug put into(insert) the patch board, it is supplied with electricity. And when you want to pull it out, all you need to do is just a little slight push on it, the spring below would bounce back and force the slug out.
Zhiqian Zhang Liang Ma