[tied] Re: a-Epenthesis: This time its personal

How would either of you two's theory, O-infix (onfix?) and a-
Epenthesis account for Latin <umbo>, Greek <omphalos>, English
<navel>? Is the rule (whichever) applied only partially?
Einzelsprachlich? Only in some (grammatical) cases?

BTW on the legitimacy of the extra vowels of Glen's dog *kawana-,
*kawanasa- : I found Luwian <kuwana->.

Torsten