Hmm. 88 Schwinn World Sport 12-speed. Shimano FD and RD.
I replaced the bottom bracket's caged bearings tonight. No problems, much smoother pedal operation now and with no play. However, upon re-assembly the FD chattered and then sent the chain over the top of the big ring. It's as if the chain rings are now slightly closer to the bottom bracket.
Pretty sure I checked the orientation of the spindle during re-assembly. It appears to be the same length on both sides, the only difference is a raised band inboard of the cone on the drive side. I cleaned it well before re-assembling and applied a bit of grease at all threaded connectors. Did I tighten the right side too much? TIA.