Say you want to dig some post holes but you don't have your own post-hole digger. And to make matters worse, your toilet plunger is broken, your shop vacuum is in the shop and your brother never gave back that screwdriver set you lent him. Fear not, tool-less handyman or -woman. The ReSource Tool Library, a project of Boulder's Center for ReSource Conservation, has an inventory of more than 2,500 tools that can be borrowed for the cost of an annual membership ($25 for an individual, $40 for a couple, $100 for a nonprofit) plus minor tool-handling fees that range from 25 cents to $4.75 per day. And starting in April, the library will offer Tool School, a buffet of more than fifty classes in subjects like kitchen tiling, bicycle maintenance and how to build a backyard chicken coop.