Just completed a mini tapper from internet plans. Works great for #2 and under sized taps, allows the feel of tapping and greatly reduces tap breakage. Was a fun project to build as well. I am a tooling freak among other claims to infamy. Base size is 6x6 inches 1/2inch CRS procured from my local metal monger. Print called for a 3/4 inch thick piece of aluminum but i am a firm believer of using materials available to complete the project. Just a frugal quirk I guess.