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Usually the operation is not smooth because the burrs are not trimmed cleanly. Check whether the burrs of the parts are completely cut according to the instructions.
You can contact our online customer service for supplementary matters
1. Disassemble according to the reverse steps of the manual
2. The registration number of the separated parts, so as not to worry about changing the parts next time
3. After the disassembly is completed, another change can be assembled