ALL 6! The extra carriages didn't thread into the holes so the screws didn't go in properly, making it impossible to assemble 3 out of 4 boards. (Pre-assembled board trucks were ok) Got a replacement and SAME PROBLEM! Even before opening, I noticed through the packaging with an LED magnifying glass and saw that the extra truck holes are smooth and unthreaded like the last ones. Major Error, Tech Deck (Spin Master). How did you pass the quality check? PS This is also probably an issue with other reviewers saying it "was disassembled" or "couldn't be reassembled" etc. All Element 4 packages are probably like this. :(
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