assigning keystroke in mode table/zmacs question

[drstrip@cs.sandia.gov (David R. Strip)]

I would like the tab key bound to com-insert-tab in c mode - so I wrote
the following which does not seem to work.

(defmethod (:mode-forms c-mode-mixin) ()
  (append (send self :c-mode-forms)
	  '((set-char-syntax list-open *mode-list-syntax-table* #/[)
	    (set-char-syntax list-open *mode-list-syntax-table* #/{)
	    (set-char-syntax list-close *mode-list-syntax-table* #/])
	    (set-char-syntax list-close *mode-list-syntax-table* #/})	    
	    (set-comtab *mode-comtab* '(#\TAB com-tab-insert))
	    (setq *comment-begin* "//*")
	    (setq *comment-end* "*//")
	    (setq *comment-start* "//*"))))

c mode flavor mixes in c-mode-mixin.
So - what am I failing to understand. Thanks
Strip