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Step 1.
Attach C to B by using bolt H1, flat washer H2, spring washer H3, not tighten fully
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Note: Do not fully tighten the hardwares at this step.
（
H1
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×4
M6 *15 bolt
（
H2
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×4
M6 flat washer
（
H3
）
×4
M6 spring washer
