How important is the cotter pin?

I installed some DIY skateboard wheel axle/fork sliders and had to remove the cotter pin from the castle nut. The slider sits tightly over the nut. Do I need to go get a lock nut or will I be OK?

I do not use a cotter pin. If you are confident in yourself to tighten the nut, you do not need the pin. Some motorcycles do not use a pin or lock nut.

I believe it might be required from the factory for certain countries. I haven't had the cotter for quite a while. There is enough torque on the wheel nuts it should not be an issue. Uh, make sure they are torqued to factory specs though.....

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