The one who often have to use a vise knows that the most difficult thing is to hold them a wedge-shaped or cone detail: when processing it loosened and slips out. However, if you apply a semi-cylindrical auxiliary plate, the problem will be solved: surface it is firmly pressed against the cheek of the wedge or cone, and its spherical surface are well dock with a sponge — holder in the vise will be reliable.
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