Hey Feracon, if there’s hidden geo inside the object simply go down to the Polygroups palette in your Tools menu.
Click Auto Groups, and turn on Polyframe (shift + f). Now if you ctrl+shift click on the outer mesh to hide it, you’ll then see if there is indeed any hidden geo inside it. Turn on double sided also, to get a clearer picture of all angles.
Basically if your outer mesh can become hidden, then there is in fact geo inside it, it may be tiny.
So to delete the geo you don’t want, while the outer mesh is hidden(which should all be one polygroup), use ctrl+shift and drag down your pen on the tablet, or mouse, to invert the visible objects.
Now press Delete hidden, Tools > Geometry > Modify Topology > Delete Hidden button
The easier way to split the Hilt into two pieces after you’ve gotten rid of hidden geo is to use the slice curve to separate the two regions into different poly groups (turn off perspective).
Then duplicate this subtool and delete the top from the first, and the bottom from the second(using delete hidden method above). You can then if needed close the holes using Tools > Geometry > Modify Topology > Close Holes button.
If you want to Dynamesh them again,just use Merge Down in the subtool palette. Best to turn on Groups, in the Dynamesh menu, so they stay as separate pieces, and then Dynamesh.
Hope that helps, Cheers ~