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bad proto locos
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<P mce_keep="true">[quote user="ICRR1964"] <P>There were several talks on what caused this to happen, from wrong type of grease, to small of a bore hole in the gear, and abuse to the loco. . <BR></P> <P>[/quote]</P> <P>Lots of stories, but in speaking to a Walthers repair rep who assured me he was a first hand witness, it was an unwittingly small bore being made by just one of the drilling and assembly units. That's why they will crack at any time even later in the future, even just sitting NIB on the LHS shelf. </P> <P>The excess potential energy created when the press sets the gear on a too small hub remains in the molecular structure of the little hub of the plastic gear, and then releases as the plastic ages....whether it is ever used or not. The aging plastic is not able to withstand the forces contained within it.</P>
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