12mm Wheel Hex bearing adapter and center cap
thingiverse
Trailer constructed, but still lacking in wheels for now. A 4mm carbon rod served as the initial wheel axle choice, but further modifications were necessary to complete the installation, including creating a 12mm hex that perfectly fits a 4x10x4mm ball bearing, which we ended up using a flanged bearing for. The fit was snug at first, requiring some sanding and filing to achieve a secure connection without the part breaking apart. However, with patience and persistence, I successfully completed the task. Once assembled, the trailer is now being utilized by my wife, functioning smoothly and efficiently. The center cap presented another minor challenge, as it was initially too tight of a fit; fortunately, a 4mm drillbit proved to be an effective solution for opening it up slightly.
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