Knee will not bend. Don’t know what is wrong with it. Selling for parts because I can’t figure out what is causing the knee to not bend. No top adapter to the knee. Any 4 hole pyramid can be attach to the knee

Item has been inspected and tested, with no functional issues. 

Look at all the pictures 

I would also recommend googling the item or go to the manufacture's website to find more detailed information about the item 

All international shipping will go through eBays international shipping program.