I removed the door cards and used some large washers and short bolts for the top (inside bag) and at the bottom bent a bit of flat tubing at a right angle bolted and again through door card. This takes the weight of the chairs on the door. Bolted bottom of bag through tubing and then covered front of tube with rubber caps ( see photo's above caps just visible.How did u fix them to the doors? Is there a velcro strip on the back ?