Prep 2

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I replaced rear diff drive cup.
First I used Xray drive shaft.
Xray spring steal is harder than cup.
Front cup is not so.
Mugen shaft pin and cup are same hardness.
Trifecta wing are mounted.
I tried some types wing.
Long rear arm car likes low mounted wing.
Especially trifecta make easy breaking rear on the out of corner.
I like policabonade wing but it has no durability.

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