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It's been a while since I used it but I think it was just the standard foot with the needle position offset to get closer to the binding edge. I just had a look at the last binding I did and the top/bottom balance is pretty equal, getting the binding really tight to the fabric edge was more of an issue for me.
If I get time at the weekend I'll set it up and can take a few photos.
I also couldn't justify buying the swing away binding attachment but have found this fixed version to be pretty good.
https://www.aliexpress.com/item/32918421828.html?spm=a2g0s.9042311.0.0.200c4c4djwh8Ap
Takes a bit of time to set up but for hobby use it does the job ok.
Edit - posted at the same time as @merl
Interesting to hear it's not working so well for you - it took some initial set up to work out the best mounting holes but I've found it works well positioned very close to the foot. The only difficulties I've had have been sewing round tight corners but I think that's more to do with my bad technique than the binding attachment.