i'm flatered you guys liked them so much you took pictures.
as far as a how to- just filling them is very simple, seal one side and fill.
i remove all the material from the inside of the rear mounts and re-cast the center shafts in only poly. the trick is keeping the shaft straight and centered. i have a jig and fixture to do so, i imagine it being prety dificult to do it my way without it.