IAI America FS - Manual (Page 44)

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5) Loosen the locknut to make the tension adjustment bolts free.
(Use a spanner wrench of 8mm.)
6) Loosen the tension adjustment bolt on the motor side.
(Use a hexagon wrench with the distance to the opposite side of 4mm.)
7) Detach the end cover on the motor side.
(Use a hexagon wrench with the distance to the opposite side of 2.5mm.)
Tension Adjustment Bolt
Locknut