[Randy Picolet]

In our kit, some of the high-tolerance axle bolts shoulders also had "high spots" that interfered with the low-tolerance bearings. We had to file these down until the bolt slid smoothly thru the bearings....

Also, when tightening up your frame and axle nylocks, use an incremental pattern approach (like when you replace a flat tire); tightening one part/axle can affect the alignment/tightness of another, as you are actually stressing the frame parts, so "creep up" to/tune your final nylock positions...

In general, don't assume the kitbot has great part interfaces; sometimes you have to do minor "repairs" or "enhancements", depending on how you look at it...

Finally, don't feel obligated to use nylocks for the frame; they are a pain, and regular nuts with spider washers or keps nuts are much easier to work with (and you will be taking it apart and putting it back together over the course of the build/competition season).