Andersen suggests to help with securely holding the frame brackets to the frame you use one of two methods: 1) Drill a hole into the frame (per the installation instructions PDF) to allow the set screw to 'screw' into the frame itself, or 2) Add a 2-inch weld to the lower backside of the outer bracket (again, per the installation instructions) to 'lock' the bracket to the frame

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Heavy Duty
But with this project you can have one that is almost as good
While I like the lanyard internally and the simplicity of it, I quite like having a small pouch inside the bag for small odds and ends that can easily get lost in amongst the other stuff