Hi Pete....just digressing......in November last, I rolled over & fell from
the momentous height of about 8" .......off a 5" gauge steam train guards van ride [trying to stop a grandmother from colliding with the gravel around the track]
She had a few licks of skin off her elbow......I ended up in Hospital Casualty.......yes they thought I had a torn Rotator
I had never heard of a Rotator...but sure can tell you what the pain was like

Moral of the story...'if you see an 80 YO Grandmother falling over off from a model train.....[look the other way]'
Hope the recovery from the surgery is OK.....
Still have not figured out why you are now committing your engine build to Fusion 360 after it has been built & commissioned...
Derek