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INSTALLATION MANUAL MULTIFUNCTIONAL SURFACE MOUNTED ROLLER SHUTTER VR150
7. Insert this into the new axle with netting.
A (1 : 3)
B (1 : 2)
8. Tighten the spring using a key. In most cases this is after 18 to 19 rotations.
Remove the key carefully so that the spring is not released (it is released when
the spring fitting is pressed).
A (1 : 1.5)