Slightly off topic, but I broke my extender. I wanted to fit the bracket on my folder, but the spacing of the two mount points is just wrong, and they foul the Aber Hallo extension stem that I have fitted. I can fit the bracket, but it distorts enough to prevent the spring release from working properly.
So, I thought, I'll add an extender and it can take the distortion, then the bracket fitted to the extender will work properly. It didn't. I couldn't get the bracket onto the distorted extension. So I carved away bits of extension. Still no luck and, on one attempt to spring the bracket on, I broke the extension
So I'm back to a post mount on the riser. Problem is, it has to be in just exactly the right place, or it fouls the fold
And when it's just exactly there, fitting the bag is awkward because the bars get in the way
But at least there's an unparalleled range of options, and one does mostly work