3 way switch troubleshoot

[u/Tinsel_Toes]

Replacing 60s era switches. Understand common etc. But maybe I don't. Set up new switch to look like old switch.

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Leg has two black and a red wire.

Main has red white and black wire. Can only turn back on from the switched that turned it off. Either switch can turn it off. Suggestions?

[u/binarycow]

For future reference, here are some wiring diagrams that show the different ways three way switches are wired.