http://www.item.ca/products/
This is a good online catalog.
If you want to order some of this stuff call item-midwest at
262-363-4800. They are our team's main sponsor.
Through bolting is usually not necessary with the higher grade systems like item and bosch.
Tobor was/is a great robot. Marge (our fair lady) proved robust and relaible, too (we used 20x20). I think we are using 20x20 again this year, but I may suggest a switch to 30x30 lite.
Welding is very strong, but can't welding cause base metal fatigue/weakening to the areas just outside of the weld on aluminum?