Description Say “Goodbye” to burrs, crimp marks, polishing, and bending! These BSA Pine Derby Car Speed Axles are precision-made to replicate the official BSA nail, but without the burrs and crimp marks. They are polished to 3,000 grit(1), and then bent to allow for rail-rider alignment.(2) Just lube, align, and race. Benefits Accurate, round shaft to improve performance, No burrs and crimp marks, eliminating tedious work Axle head is slightly and accurately beveled to minimize contact with the outside wheel hub Axle head is round and centered on the axle shaft Shaft is polished to 3,000 grit. 3 axles are bent at 2.5 deg, and one axle is straight (for raised wheel). Usage Gently wipe off the axles with a soft cloth, then lubricate with good quality graphite (we recommend Max-V-Lube). Mount the wheels and axles on the car. The front dominant axle should be angled down and the gap set to the normal 30 thousandths. The rear axles should be angled up and gapped twice as wide as the front axles. Roll the car gently back and forth on a smooth surface and watch the rear wheels. They should stay on the nail head regardless of the direction of travel. If a rear wheel moves to the car body, slightly rotate that axle (use Axle Extraction Pliers) and test again. Repeat until both wheels stay on the axle head. To adjust the front steering, an alignment board is required. The car should drift towards the raised wheel about 5 inches over 8 feet. For more information on alignment boards and aligning, refer to this article on rail-riding. Technical Information (1) Three-thousand grit polishing produces an axle that is generally shiny to the eye, however, this polishing level does not produce a mirror finish. Fine polish lines will be seen under magnification.