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I assume the retaining pin is broken and I'll need to get a new one if I need to use the thrust buttons? Any idea where to get one?

I believe a garden variety roll pin (of the right dia/length of course) will suffice. After more thought, I'm WAG ing but with the housing/axles untouched/buttones were in place (till they fell) & all that is left is either the bearing position ain't right (i'm thinking not that) or a piece (spacer of some sort) is missing from that aftermarket disc assy. An idea might be to remove the disc assy & install the buttons and a pair of drum b plates & slam the axles in real quick & see if the end play straightens out. That'd confirm that the prob is in the disc assy(s) & that the bearing (position) is fine

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