I can easily imagine having problems with attaching hardware to fiberglass tube…we have only used channel, angle, and I beam shapes, which are much easier to deal with.
You do have to be careful with design, taking into account the properties of the material you are using.
For round tubing, clamping might be a safer way of attaching it.
It was square tubing. Sorry for the ambiguity.
We got a particular chuckle out of you guys during the playoffs at MARC. Three of your students had pulled your robot over to the side of the staging area and were beating the poor thing. After a few minutes, someone went and got a hammer and you really started pounding on it.
Whatever you were beating on must have decided to cooperate, because your robot worked brilliantly after that!