UPDATE....
I am still trying to avoid cutting the main 1" copper supply line to the house so my next step was to isolate the water pressure tank with a flexible line, to eliminate that as the possible source of the vibration. See below for pictures.
Once again I thought this was the fix. After I put the flexible line in to the pressure tank I turned the pump switch back on and the pressure tank filled up completely silent, no vibration at all. Then I opened the ball valve shutoff to the rest of the house. The next time the pump switched on the vibration was back.
I think I have asked this before but could it be the source of the vibration be this Watt's ball valve shutoff? (It has to be this or something else down the line from, cant imagine what else it could be)
I guess my next step is cutting into the main supply line to the house and installing a flexible hose. I would rather avoid this and replace/repair whatever the source of the vibration is.
View attachment 30433
View attachment 30434
View attachment 30435