I made a chamber that goes under my mower. I lower the mower deck down on it and I
feed leaves into the chamber from the opposite side from the grass catcher.
The first iteration was made with
cardboard and pink foam pieces. It sustained damage from bits of flying debris requiring a remake with plywood, lumber, and aluminum plate.
The concept was proven with the first iteration. That day the leaves were dry. They got sucked into the chamber easily. The latest collected leaves are wet and I haven't used the new chamber yet. I hope the wet leaves will still get sucked into the new chamber.
The pictures are of the first iteration plus one picture of the new version. The ground leaves end up in the grass catcher bags. It worked very well. I did 15 bags of leaves the first time I used it. Those ground leaves are in the metal screen thing in the picture.
I'm going to make leaf mould with the ground leaves. After learning about leaf mould, I dragged leaves out of a pile that wasn't really composting and mowed over them creating a wonderful rich dark material that is almost like soil. They say leaf mould only takes about 6 months to make. We will see.
My soil here is heavy to clay and rocks so my garden is in raised beds. I made two no-dig beds with those ground leaves from the pile. They had lots of worms and worked very well.