Is that projection at the end just a handle that is being held in place by the metal rod so that whatever that slides in can be carried around from place to place?
Look at page 276 and at the bottom #2758 JeeKinz wonderfully managed to blow it up to give a few more details though you probably know already when you blow up small pictures they get blurry but it really helped me with a few more guesses. Good luck and welcome aboard!!
Carpentry was going to be my next guess as well but Katie E., says "Nyet"-- so how do you say "oh, pickles" in Russian?? Where is Charlie D. by the way?