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4.375" on Center. The slots are typically not exactly 90º and inconsistent on slot widths, allowing for difficult axle insertion. Under pressure and force, the axle forms a groove into the slot and is very difficult to adjust alignment if not inserted at 90º
Side Drilled 4.375" on Center. Drilled to 90º making axle insertion more accurate and true.
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Derby Car Supplies * Derby Car Wheels * Derby Car Kits Pinewood Derby™ is registered Trademark of Boy Scouts of America
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