>t's not meant to be a "general theory" ...The CVCC/CCVC thing only
> accounts for the extension *-eu- and *-ei-, the s-aorist and the usual
> accent alternating verb pairs (eg: *ters-/*tres-).
Forgive me climbing on board a thread I have only half been following - I
may have misunderstood what you mean. If you are talking about the
schwebeablaut alternation CVCC / CCVC in PIE in general, then isn't it
rather more widespread than just those extensions? There are a number of
roots which show it, and it's a rather important factor in the laryngeal
theory. You probably didn't mean PIE roots in general, but I need to
check,
Peter