“The concept is good but the blocks are a bit small for an adult male hand. I found it more comfrtable to cut off the corners of the upper block - very easy to do with a stanley knife - but be careful to keep your fingers out of the way. The emery paper it comes with is not much use but if you remove it KEEP IT as a template for replacements, All in All a good idea made of tough poleypropelene which should last well.”
