HOW DOES THE SPRING RESEAT FROM BASE TO FAN ON VORNADO 750?

My V-750 was packed with dust clogs throughout. I took the front grill and backside cover off, and meticulously worked with tweezers, a pick and compressed gas to clean it out. I was astounded by the huge amount and huge chunks of dust that I got of it. After cleaning the blades, grill and cover and putting the grill and cover back in place, I plugged it in, turned it on and it began making a very loud noise, like metal banging and clanging together. I thought perhaps it was ready to taxi the room and fly, so I shut it off.

I took it apart today to check for loose/broken wire in the motor or any other obvious problem. Everything looked OK, so I was able then to clean out all the dust I hadn't seen prior -- a bunch of it. I have it reassembled to the point of attaching the base to the fan.

I am puzzled as to the proper placement of the spring that sits on the base column at the top and seems to work with the niche cutout in the column. I want to make sure it is properly installed.

Can you please advise me as to do that? I appreciate any aid you can give me.

Thank you very much,

Tom (tms331@sbcglobal.net)