Thanks Security. This is very intriguing. By your description, it sounds like whoever M.V Motors were (never heard of them?) did not use a balancer. That is why your turbocharger had so much wear and failed, due to not being balanced. When I was rebuilding, the turbos which I received from Aaron, would not be passed back to him until they had been properly balanced and assembled.
How I built the turbos (originally) was...I supplied brand new Garrett water cooled core, brand new bearing seal kit, brand new turbine shaft (STG 1), brand new TO4 compwheel and machine covers to suit. I did the math and engineering side to show what airflow would come out of these small units. Power level was between 200-250kw.
The reason I stopped was it went pear shaped on the business side and I was forced to sell up everything and find a job to get back on my feet.
If you want anything done, drop me a line, only too happy to help.