impulce 2 IT8003 Assembly Instructions Manual page 11

Step4 Assemble The Arm
1)Insert the Arm(#6) into the Main Upright(#1) and thro-
ugh the Pillow Block(#20).
2)Attach the Counter Poise Block(#19) to the Arm(#6)
using:
two Spring Washer(#64)
two Shoulder Bolt(#54) M8×25
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Φ 8