Gary- I teach photography at the local junior college here and one of my students has a silver Tiltall tripod. One of the rubber feet/spike assemblies came off some time ago and he bought a replacement. The new foot doesn't screw in completely for some reason. Might you have any ideas as to how to solve the problem for him? Thank you, Ed Kreiser, The Levan Institute, Photography Division.
The foot threading is one spec that did change through the various iterations of Tiltall.
If your student want to keep everything in his collector's Titall as "stock", then I suggest that he follow EBay for the identical model and partake in some foot cannibalism. If he bought the new foot from me, he can return it for refund.
However, if "stock" is not necessary and as you have the resources of a college at hand, I suggest a visit to the machine class for a bit of a marriage ceremony - threads can be re-threaded.
Failing that, some Tiltall owners have removed the offending threads from the new foot and simply epoxy'd or gorrilla glued the new foot into place. A bit brutal, but works.