how to fix a homelight weedeater that came apart?

i have a homlight weed eater worked fine all summer but went out to use it this year and when i picked it up the engine and the rest of the body came apart so i stuck them back togeather and the engine started just fine but the weed eater itself dosen,t move and i notesed that whoever had it before had used this heavy red tape to put it back togeather there must be something missing like a short driveshaft maybe?