Take a tetrafluoroethylene tube that is 2 times longer than the tube, and cut the length of the tube to the same length, so that the tube can be pinched to a partial overlap, the diameter is small, can be inserted into the tube, and lubricated with detergent and water. After that, you can pull it.
I just clamped it directly, and the foot was smashed directly, and the stainless steel was used for verification.
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