You can take a pen apart and reassemble using the same components, however, you may have to use glue to secure the parts. Some use CA, but as is cures and off gasses, it can leave a white film on the metal pen parts. Some use epoxy, but IMO, it can be too messy and is difficult to take the pen apart. Some use red loctite but is very difficult, if not impossible, to take the pen apart again with out damaging the pen. I prefer to use blue loctite. It is not as hard to get the pen apart if needed.
edit in: Adding to Jim's post, get yourself a set of
transfer punches. It will make disassembly a lot easier.