I am remodeling a kitchen and we had a friend come and install marmoleum floors and countertops. I always enjoy working with different contractors because everyone has their own systems. Brett was quite meticulous, which comes with his vast experience. I was impressed by his carpet stair tool, which I had never seen before. It looks like a big masonry chisel, but he used it to level seams between plywood subflooring edges.
Once two sheets have been nailed down next to one another Brett ran the edge of the tool along the seam — it runs smoothly where the sheets are in the same plane and hits a bump on one side or the other if the sheets are out of plane. He then took a hammer, hit down the side that was high, and ran the tool over the seam again to check. The he filled the seam with a fast-drying mortar to ensure the seam was strong and stayed in plane.
The carpet stair tool also has a mushroomed head for striking with a hammer. But you can also use it to drive down nails that are hard to access because they are under cabinetry toe kicks — just put the mushroomed head against the nail and hit the blade of the tool with a hammer.