Part 4:
Mounting the T-bar:
This part is made of anodised stainless steel, so very strong. I think it might bend but I don't see it ever break. (the chassis is anodised aliminium).
This T-bar is mounted with some provided screws (short 3mm ones) and the two "T-bar-mounting-plates". Again, I used Thread-lock (but you don't need to, says fabs).
On this picture, the left side is bolted on:
to be honest ... this is one of the parts that we discovered not being flawlesly made. Fabs did a minor filing to make it fit the chassis.
aaaand then the right part was bolted:
which gave us:
