The hole really has nothing to do with how tight the threads feel, as it engages on the pitch diameter of the pin. A wobbly tap when tapping will cut the pitch diameter oversize and make the threads very loose. If the hole in is truly much oversize then you won't have very strong holding strength when torqued together since there is less thread height. They will likely strip out if that is the case, eventually. It shouldn't really affect play in the meantime just for occasional extended reach. If the id is ok but the threads feel loose and sloppy, put a few drops of wax, like Meguiars car wax or Turtle wax, in the threads, and screw it together a few times. You want the wood threads to all get a bit wet, then screw the extension on and leave it to dry for a day or two. This will swell the internal threads around the pin and make the joint feel much better.The adapter is made of Aluminum so that might effect any fix.
