2000 f115 yamaha lower unit

[rmejia5773]

I recently had a certified mechanic serviced both lower units, replaced both water pumps and the prop seals, I had the props seals replaced since I noticed the lower unit oil a bit milky; yesterday after i rinsed the motors noticed the right engine lower unit (aluminum prop) while in neutral and engine not running, i spun the prop to the right by hand, which is the normal fwd rotation, it makes a clicking noise at the beginning of the spin not when is continuosly been spun by hand, the clicking noise is only at the beginning of the spin, however when i spin it to the left, it spins smoothly no noise at all, I pulled the magnetic plug and noticed one small metal sliver the diameter of a hair and 1/8" long it appears slightly curled and flat. Can anyone give me any thoughts on the matter? is this a serious problem? or just keep an eye on it to see if the noise gets worse? I appreciate any help.
Thanks!

Robert