The DA900 spring is connected between the head and a cap that bolts to the top of the column. Which also means it UNbolts from the column, and I did that when I sent the head to the guy in Italy who bought it. All I have left is the big piece of aluminum that is the column, sorry.

The base did make it to Germany successfully, for those who were wondering! I wonder what the column would fetch me down at the aluminum recyclers...?