Old thread, and the OP’s profile indicates they haven’t logged into the forum since 2016.
You are correct that not all the clones have identical frames and axle attachments, and it’s possible yours was modified by a previous owner. If it’s different in some fundamental way, describing what you’ve got with pictures is helpful. I agree that a new axle with
brakes (and perhaps a bit more clearance) is a great improvement.
Best wishes!