I'm investigating vibration when travelling about 30mph. Typical suspect, UJs. There is a tiny bit of movement on move props, so just whipped out the rear to changes the spiders. On inspection the spline on the prop itself (don't know the proper name, but the bit that allows the prop to stretch or shrink few inches) also has some minor wear. How much? Can feel it when I counter twist the two halves, but barely see anything with the eye. Fractions of a degree. Is this OK or is it new prop time?