Paragon Transmission

[mestrezat]

I had to have my old Paragon transmission replaced last August and the boat yard people were lucky enough to find me one to take the defective ones place.
Since it was installed, when in neutral, the prop still turns in a forward movement. Not fast mind you but enough that it will move the boat if at anchor in a windless harbor.
If I grab the prop shaft down, it will stop its movement. When I let it go, it starts to revolve again.
The boat yard says that the Paragon people told them that this is all part of the "break in" period and will eventually stop after a few hundred hours of operation. I think it is more likely that after I use it for a few hundred hours, I'll be far enough away that I can't take the boat back to them for correction of the problem.
Anyone have any experience with this situation? Any suggestions? Are they correct about the break in period?