I agree with dwallersv that putting them on is where we do the most damage, to clear the locking tangs on the clips we have to go another about 1/8'' and this is where we pass the elastic limits of the steel and go into the plastic zone, that's why they remain lower after several installations. I lift (bend) them back in position when I detect they are not pushing the prop hub on the clips. DO NOT do this after every flight because you are causing more damage, this has to be done none the less or your props will be lose and will cause vibrations first then may fly off. I do mine around every 15 flights and see no fatigue cracks yet. I plan to change the clips and springs for $6.00 once a year or when needed, which ever comes first. I have a metallurgical microscope at work and plan the photograph the used clips and compare to the new, I will post the pictures sometime in April when I change my prop mounts. By the way I take mine off almost every time to store the bird in it's case.