To position the fabric for long segment tests:
Ensure both clamps are up by loosening each tightening knob and lifting the top until it stays in the open position.
Slide the sample right side down, over the bar and the square block, under both clamps. Align the short edge with the stopper on the fixed clamp.
Lightly fold up the loose end on the other side over the bar, so that it fits within the stopper on the movable clamp.
Ensure the fabric is straight (centered between the clamps) and flat, but not stretched.
Close the clamps carefully without shifting the sample. Hold the two sides of the black toggle plate down while tightening the knob evenly. Check that the needle on the force gauge is in the center.
Do not over-tighten the clamps, as this affects how the material performs.
For older clamps, when using the almond-shaped tightening knob, ensure it is parallel to the clamp edge so that the fixed and movable clamps can come together without the knobs knocking into one another.