I did up this very quick design because I now have to use a cane - and at my desk at work it was constantly falling down... I'll be adding an anti-slip pad to make it more secure. I did it in this fashion (rather than with a dial lock) so I could easily just grab it and take it to meetings and slip it onto different thickness tables tables.  It fits most of the "break-down" style canes I've seen in stores (meaning I brought it to try it on them)... 

(feel free to give tip$)