Seized Cross Shaft another look at that old chestnut

[Bob Culver]

This has been extensively covered, esp on the old site with deatailed photos. Hopefully someone can supply links.
The concentric tubes are only to allow for equal twist left and right from the central application. The movement between tubes at rh end under load is very small. Test with tyre lever or somesuch. Not the end of world if stuck; very many probably are.