I was supposed to attach it to the seat post with a provided clip but I like to live dangerously so I attached it to the frame with zip-ties instead. The duct tape is there to prevent the frame from getting scratched and the grip tape keeps it aligned and from moving around.
I installed several fenders on several bikes this way, and they are keeping up. Impressively sturdy.
Yeah this sort of DIY customization is a common theme on my bike. This fits right in. The fender itself has a duct tape “paitjob” too just like the rest of the bike.