5.4 x 5.4 Alignment Peg for 20x20 T-Slot, 60 mm in length
I made this little Alignment Guide for the 20mm x 20mm T-Slot
http://www.thingiverse.com/thing:10261
Slide it up the center hole if required to help Align the T-Slots when your Gluing them together in the welding jig.
http://www.thingiverse.com/thing:13598
I made it 5.4 mm by 5.4 mm to allow a tight fit for Alignment.
I hope this comes in handy for some people.
Please if you use it let us know.
Many thanks to Proto Paradigm for the 20x20 design.
http://www.thingiverse.com/ProtoParadigm/about