well it looks like I am the first to comment. So here it goes, I like ash for longbows, but I am not sure if this is what you are speaking of as the long bow is a great bow on the ground but up a tree is another thing.Handles usually : I start by finding the middle and three on each side, if I cut a handle i only go about 1/2 inch to the center and 1 1/2in up from the center line.You can make it 8 inches then taper the fadeouts and you will loose 2 inches,either way 6inch is what you end up with.For the twist I use heat gun or space heater to heat the limb, warm it up too hot to touch , not burning, then i make a wooden lever to twist the limb back to straight. You can steam it over stove with foil covering it for about an hour and twist it or clamp it to a form, you made. However the heat is quicker. You may want to grease the wood prier to heating. Long bow, first time, spend 20.00 bucks and order a PCs of ash 1/4 sawn straight grain and cut an edge 1 1/4 wide and 68 to 72 inches long allow for the tips remember the d style bend in the handle. Any other questions just ask good luck Denny