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Hoping someone here can help.  I have on older MTH 4-6-6-4 Clinchfield #670 PS1.    There are small screws that attach the armature rods to the hanging machine.  Not sure when mine fell out but I tried to run and noticed it’s gone.  Attached are some pics of where the screw goes and the size, I got these pics from a good screw still attached.  Any ideas of what size these are?

I tried to find a parts diagram but the engine doesn’t have a model number on the box.

Any help is greatly appreciated.

IMG_6039IMG_6041IMG_6042

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Last edited by Big Daddy NJ
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That is an older model, ….I remember the older ones being all thread…..not sure I remember thread diameter though,…..so take a look at this, ….this is from the slightly later PS1 through PS3 locomotives, from the same spot your screw is missing, ……you can see the dimensions in the picture notes. See if it’s a match to yours,….instead of searching for your exact locomotive No. search instead exploded views, 4-6-6-4 at mthpartsandsales.com ….call out no. is # 170 on the Challenger list,…

Pat IMG_8007

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