I, too, am with Brad on this one. I try to make any special tools before buying. I often hit the pawn shops looking in the used tool bins. I buy an assortment of tools, for a few dollars, just to keep on hand. I then use them to make up any special tools. Working on aircraft engines, at times, you need specialty tools that may cost hundreds of dollars. I try to make then up if I can. An example, a special wrench to remove a 5/8" cylinder hold down nut going around an engine mount and you need 2, a left and a right. These nuts are on throught bolt. Cost about $250-300 each. Pawn shop cost, a few dollars in socket, extensions, etc. a little frabrication and some welding or brazing.