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Important: FIRST snap-on the clamping-part
Select correct collar-part version: stiff collar (has a black marking at the inside) for 190 and 240 / soft collar for 140, 160 and 170
Mount the correct rubber-adapter onto the collar-part: (thick) RDM-adapter for 140 and 160 / (thin) SDM-adapter for 170, 190 and 240
Connect the collar-part with the clamping-part: push the collar-part and the clamping-part against each other. Important: push the clamping-part in the MIDDLE
Now add the lever and the hinge parts and finally screw everything together. Important: you have to use an electronic screw-driver.