Hold it in place for as long as you want to. Keeping your shore tight against any slab is made easy during reshoring with Ellis Reshore Springs. No more wased lumber or labor used in cutting and nailing shims to the top and bottom of each shore. Just one nail hole is needed to secure the reshore spring to your shore tops. Although 200 lbs compresses each reshore spring flat, it returns to its original shape to be used again and again.