Hex Driver Diff Tight­ness Tester

RC Car Action - - PIT TIPS -

This one’s a clas­sic. To test the tight­ness of a ball dif­fer­en­tial be­fore in­stalling it in the gear­box, in­sert a pair of hex driv­ers into the out­drives to pre­vent them from turn­ing as you at­tempt to turn the diff gear. It should be very dif­fi­cult to slip.

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