End parts for cable chain

I had originally used a simlar chain by eddiema: https://www.thingiverse.com/thing:40918
but needed max 17mm and so the scaled down version was not so good (too loose). Then I found this version but there were no end parts. Hence I used the design from eddiema! but made smaller. very complicated but there are many similar designs!
I include freecadfiles in case anyone wants to modify.
My thanks to Codiacx for sharing this version!!