MP40 Expected Bearing Life ?

[DiverDude]

What are people seeing for lifespan on the MP40 bearings ?

Mine's about a year old now and it seems to be making more noise -as though the 2 halves weren't perfectly concentric but looking at them, they are; and no amount of tweaking can make it better.

I have a whole new unit in the box, so I can try swapping wet sides and see how that goes but if the bearings in one side are gone, changes are the other side's aren't far behind.