Buying a metal sleeve will cost me a lot. I thought of making one out of steel pipes, but a friend of mine told me I won't get a perfect, snug fit.
A myth or two is at work here. FIrst. buy a piece of DOM (drawn over mandrel) seamless tubing. It's smooth inside--no weld. Then work your billets down to be a slip fit in the tube. Next take the end that is to be solid and epoxy it in. When the epoxy has cured, wax the inside of the other end of the tube, spread epoxy on the second billet, slip it into the tube, rotate as needed to line up and wait for the cure.
If you did not shape the limbs before hand, layout your edges and go to work. If you did work he limbs first, tiller them out and finish. String up the bow and shoot it a while. By that time, the removable limb should be removable without straining yourself. If it still won't come out, just shoot the bow day after day (I know, a real drag) and it will loosen up. I drill and pin the limb that stays in the sleeve. Even it can loosen, because the sleeve is so smooth inside.
I have some DOM 1" ID tubing 4"-long pieces. The handle of the small bow in the images is 5". With a 4", the arrow pass would be on the wood.
Jim Davis