My clutch tube came loose on my 75 Super, but my mechanic was able to fix it from underneath. I'm not really sure how he did it.
I recall years and years ago having the same problem with a 66 Ghia, and fixing it by just pushing the loose end back into where it was supposed to be coming out. I can't tell you if this was mechanically sound or lasting, but it worked for the 2 years I continued to drive the car. If your doesn't want to stay that way, perhaps a slight flattening or bending of the tube right where it supposed to go in would hold it in place. But don't flatten or bent the tube so much that it interferes with the motion of the cable, of course.
What should be done is to cut a U shaped cut and fold it open in the passenger side of the tunnel to give you acces to weld the tube back in place . This kind of problem shows it's self on high milage or hard driven bug's up here in Vermont . I have done this repair before for a few freinds that did the same thing after installing stronger clutch's . After welding the tube in place the U shaped tunnel cut can be welded back-up and replace the carpet or mat's and no-body is an the wiser .
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