i know this is a really old post, was researching if anyone else had built a sharpener, i built my own sharpener for less than £100 however i had acess to a fully equipped workshop with welding and machining equipment, a homemade effort would not be impossible with some skill, knowledge and basic fabrication tools, e.g my table was a granite chopping board (flat hardwearing and doesnt rust) frame was welded from heavy angle iron, grinder was a cheap £25 bench unit with one end chopped off, rest was made up from odds and ends of metal stock at work. have sharpened over 100 pairs of skates with no problems ,