Stupid question, how this construction method works eludes me. How do you attach a bolt into a piece of hollow tubing, with no gussets/welds? What is there for the bolt to hold on to? Is there some block within the tube that includes a threaded hole for bolts to pass through?
Pic of 610's 2013 chassis for reference. I'm looking at the transverse tubes and where they join with each side of the drivetrain.
