The front flex disk has about 30k miles on it. I'm working on the exhaust and naturally checking everything out while under there. If you grab the driveshart and rotate, there is rotational 'slop' in the disc. Everything appears okay - no cracks, breakage, etc. However, the flex disc bolts will rotate about 1/8 inch either way when checked manually like I'm doing. In other words, the slotted washer has some space in there before contacting the shoulder of the flex disc bolt holes. Is that movement in there normal?