I am not talking highway toll but a simple pipe cleaner test that could save a lot of grief. A pipe maker advised me long ago to always test proper alignment of stem to shank drilling with a pipe cleaner. He also strongly felt that tenon tight fit to bottom of shank drilling could make a marked difference in smoking quality. Don’t feel shy about doing these tests at the pipe shop, you don’t need a lighted loope or inside caliper kit, just a pipe cleaner.