Step 5: Splice the lower limb rotating foot assembly ④ on the upper end of the lower main
frame ③, and insert the ⑦ 8*50 screw and ⑧ with the wrench ⑨ ⑩ to tighten the double
holes.
Step 6: Insert the upper main frame into the upper end of the lower main frame, and then
use the knob to pull the pin to fix it, adjust the upper and lower levels adaptively and
flexibly, and then tighten the knob.
6
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