Don't know if the DF-03 has the ball-cup issues that the 501x has but ALOT of 501's go with RPM or Kyosho cups. Just look up the millimeter size of your cups in the part list and swap those out with RPM (I used Kyosho because my local track had them in stock for the Lazer, $3). Again, very common issue w/ the 501x's, I think the general opinion is they molded the inside diameter of the ball cups a hair too big for the ball studs they clip on. Hope this helps!!!
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