I have a knack for breaking the unbreakable and the only diffs that worked well were kyosho. But cant remember what model they were from and need to investigate further. The diff design had faults on the zxr but the zxs proto diffs ive got are as smooth as the rc10 b2 that i use and unhappy that these diffs didnt get made. As my protos are worn out im now in need of diffs that dont slip but are smooth. Tough challenge eh?
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