It started with my wife's back end. I noticed it was all sloppy and slanted to one side. It was suppose to be stiff and properly shaped. But alas as all things that are advertised, they often fall short.
On her rear bike rack was a bag just big enough for her extra bike battery at a mere 16 inches. The bag was stiff on the sides due to the extra panels. The flaw was the bottom of the bag. It was a simple floppy piece of nylon with the straps attached to them. The floppy nylon sheet was loose enough to allow the bag to easily tilt 30° to either side.
So what her back end needed was a stiffy inserted into it. I had used a sheet of 1/4" ABS plastic to attach the Aventon adapter to so the straps would not prevent the adapter from connecting properly. So I cut another similar sheet just wide enough to fit inside. I put screws through the new board through the bottom of the bag into the sheet attached to the adapter. In order to prevent the tilting I added vertical sheets at either end. Each sheet attached via a combination of metal L-brackets and scrap plastic cut into triangles to add more support. I made each sheet the same length. I should have noticed the flaw.
This proved a mistake as the height prevented it from being inserted into the bag. Each end of the bag was a different height and a bit slanted inward. After trimming the height for each end to counter the height and slant. I slipped it in with a bit of effort and it worked!
It took a slight effort to get the bag snapped into the rear rack the first time. I checked the tiltiness and found very little tilt. I kept a keen eye on my wife's back end throughout the next bike ride. Her back end was, as usual, perfectly shaped and stiff enough to stay straight up.
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