I have a great idea to mod the Hasbro FX with only 3 parts.And you must not destroy it.
This is the hasbro next to the Original Herosaber..the major problem in my eyes is that the arms are too short and too thick and the ermitter is too wide:
http://up.picr.de/23835085of.jpg
So if somebody have the skills to print or build new longer arms a smaller ermitter you could put over the 3 new parts very easy without to destroy the originaldesign.
The ermitter would only be a smaller ring on the stock one.You would put over the new pats easy over the blades.
I made a simulation with my very low computerskills..but I think it would look a lot better with the updates.Space is enough on the saber because they used very thick material.Yellow is the line where the parts are attached to the saber body.The blue markings show that you can make the tubes smaller on this point.
http://up.picr.de/23835196gt.jpg