The RevivaBlade: An Angle-Grinder-Based Multitool Blade Resharpener (opens in new tab)

Multitool blades are expensive, and tradespeople can extend their lives by resharpening them. We've looked at Jim Dimond's Tiger's Teeth invention, designed for the task, as well as the SharpTool, a drill-based solution from the Netherlands.Now there's another player on the market: UK-based RevivaBlade, who makes this Pro Sharpening Disc that fits in 4.5" angle grinders.The Disc runs $92.