If you don't have access to a RAM tool, you can try the water method but honestly it is pretty hit or miss. I'd do like others have said, just nock tune each shaft before you fletch them and once you get a perfect hole in the paper, mark it there and fletch them all to that mark. Then you will have some of the best arrows you can make! I just did this method this morning AFTER I got my bow in tune. I had just installed some new strings and cables, and wanted to get them shot in so I thought I'd nock tune while I was at it. I started getting a slight tear after 75 shots or so, so I checked everything, added a few twists to correct, got back to bullet holes again. I nock tuned 22 shafts after that and will fletch them up tonight. Feels good to know your bow is in tune and in spec, and feels even better to have your arrows nock tuned. It tightened my groups up at long range 80+ yards quite a bit. Makes shooting at 20 yards amazing and you sure don't want to shoot at the same spot unless you want to destroy your arrows!