If your cranks have pinch bolts like redline flights you dont need it, tighten the axle bolts enough so there's no play then tighten the pinch bolts up tight, then tighten the spindle bolts proper
If your cranks have no pinch bolts and tighten using just the spindle bolts like profiles you'll need it, tightening the spindle bolts will squash the BB bearings together and the cranks wont spin freely