| 摘要 |
At least one embodiment of the present invention is directed to a method of controlling the compression of a compression unit placed inside a frame. At least one embodiment is directed to indicator clips to be used in controlling the compression, which indicator clips may have different designs. In one embodiment the indicator clip has an elongated form with two rounded ends. The rounded ends are to be placed on stems of two screws of the compression unit. The compression of the compression unit increases with a distance from the screw head of each screw to the compression unit. The width of the indicator clip is adapted to said distance at the desired compression.
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