Here’s what consumers have asked with answers from Harbor Freight Tools staff and previous consumers.
I spent 24 minutes on the phone with them only to be told their product was perfect and problem was with my network. The person did not have a clue about what he was talking about.
I cannot see the particular part you are inquiring about, but could you make something to work? I am thinking you are referring to the notched piece that the handle locks into. Remember, you do not need to duplicate the piece, just make one that works. If you want to send me a picture I would have a better idea. I do have the smaller one which I think is similar. mountainsofwv@gmail, com Jim