I always keep a collection of nice sticks for tool handles and keep my eye out for more...nice long straight ones of the right species can be hard to find in some places. The way I learned it, you cut them green, trim roughly to length and cut any branches (hopefully not too many, as knots make peeling and smoothing more difficult), and then paint some oil on the cut ends and knot stubs. Then put them somewhere dry in the shade for a few months at least. The oil keeps the stick from drying out too fast and cracking, instead it dries out slowly through the remaining bark. Then when I need a handle I take one, shave the bark off with a drawknife, shape the end to fit the tool end, and attach however! Over the years I've found the best species are hornbeam, hickory/pecan, and oak. I have some ten year old handles of all three. Around here at least there is no ash left anyway. Right now I've got some Bradford pear sticks curing as an experiment...nice and straight but I wonder if they will be too brittle. The heads of various tools seem all too easy to find...just last week my neighbor had a whole set of fiberglass handled tools by his trash can....post hole diggers, shovel, and rake, with splintered handles---but I'm after the heads!