Um, pardon the ghetto tape job. Heat shrink tubing might work better.

And here you can see how the bent wiper insert is notched into the tube. It's crushed at the top because I used an oversized pipe cutter and it didn't work too well - that doesn't serve any function.

The trick was bending the spring arm to fit up through the tube, then bending it back. I'm also looking to do something with a smaller inner tube to keep the blade centered within the spring. I think that would be nicer too.