I have an ebonite pen on which the nib section came apart. It doesn't look like any one piece is actually broken. Rather, the pieces have separated. I have searched, but cannot find any advice directly on this point. Any suggestions as to what I should use to glue the ebonite pieces back together?? Thanks for any help you can provide!

Generally, ebonite does not glue up very well, especially with any pleasant aesthetics. A section is especially problematic since there are lots of pressures exerted on it.

Your best bet is to find a replacement section.

Next step is to find out what kind of pen it is and go from there.

Buzz is right - ebonite doesn't glue well, unless it's a fresh break. Even then it really works only if you have a lap joint or sleeve of some sort.

If we're talking about the section itself breaking, the outward pressure when the nib and feed are inserted will break it again. If the nipple is broken, that can be repaired, but you should send it in for repair to a qualified repair person since a lathe is needed to do it right.

Otherwise, a replacement section is in order.

Thanks to both of you for the information. The pen is a Conway Stewart Churchill BCHR. I'm unlikely to find a replacement nib section. I don't have any broken pieces of ebonite. I do have a "sleeve," specifically, the treaded part of the nib section, which was bonded on it's inside diameter to the bottom of the nib section. It looks like the original bond simply came loose. The pieces "press fit" back together well enough that I could probably use the pen "as is," so long as I don't screw the nib section on the pen body too tightly (because then the threaded part of the nib section would be left in the pen when I try to unscrew the nib section.) Of coure, I would like a more permanent solution, if you could suggest an adhesive that would work. ( Aesthetics aren't a concern, because the area of the bond are not visible when the pen is assembled.) Thanks again for your help!