Hi all, I'm currently building a sphinx style machine. I used my modified x-carve to make the plates and its coming along nicely, however the mini v-wheels are causing me grief. Originally I purchased some through aliexpress, big tree was the brand I believe. They spin nicely until they're on the machine.. I found that if I was tightening a bolt to the point it felt nice and sturdy, the wheel would no longer spin freely, and if i tightened so the wheel spun freely, there was play in the bolt.. I figured i'd replace the wheels with openbuilds wheels instead. While they perform better, at least half aren't great and 3-4 grind. I was careful not to overtighten them so I don't undertand what's happening. Is it just a bad batch of bearings? FWIW: both brands had a spacer between bearings so that doesn't seem to be the issue. Thanks in advance!