Hi Michael,

Yes the Edit/Hide button reveals the edges but I think that it is actually turning on and using the original or generating curve and not using just the solid's edges. This is what I did using the file I sent you:
1. Assign the solid an Object name. I used "Solid".
2. Turn off Object "Solid".
3. Turn on Object "Spline clerestory all crvs".
a. You can see there are strange curve remnants along with the original generating curve (pic below).
b. Click on the outer most semi-circular curve (or pie shaped) and then note that the window in the upper right corner indicates that what has been activated is a solid, not a curve.
c. Under the Object list, the "Spline..." has a full eye and "Solid" has half an eye. Doesn't that mean that "Solid" is partially on? I noticed that the half eye occurs a lot when extrude has been used.
1) clicking the half eye turns on "Solid".
2) "Spline..." should still have a full eye.
3) turn off "Spline..."
4) the solid that is left has numerous edges that cannot be activated.

I thought that once the extrusion was created, the generating spline was redundant and could be deleted. I have done that without causing problems.

Leonard