Originally Posted by Jason Rose
The pins that are attached to your trimmer shafts are BACKWARDS. Look at the instructions or pictures on their website. That would cause a lot of stress on the one upright that has the trimmer heads locked on it, the one that broke. It's not getting any support from the other upright! My point is, I've got my money on operator error, not equipment failure here.
I hadn't noticed that until you mentioned it. Could be enough of a difference to put all that force on the one upright, like you said.
But it still does look like the wall thickness of their tube isn't adequate. My double will be here next week. Will probably put a couple gussets on either side to be safe after seeing this.