Symmetrical bulges using weight mapped bulges.

When I do a main WM for a central body part, I only need to do the left side of the figure, then I can use 'Symmetry > Left to Right' to mirror the map to the right side. This does not seem to work for bulge maps. Is there a process that will mirror a bulge map on a central body part?

P.S.
Also posted this in the Poser Technical Forum, but got no response, so trying here where there is more traffic.