In the past, I use to bare shaft test to check spine. Now, I never bare shaft test. I shoot a slightly too-stiff spine, so the testing is not helpful. After I discovered the huge spine range on a dozen typical carbons, I decided it was better to shoot them all on the stiff side, rather than some stiff and some weak. My broadhead grouping on a dozen arrows has improved since I've done this (compound with release). Final tuning should take place on the range with complete arrows.