Hi,
Offhand, the
double springs are already installed inside the Audio Insulator (Foot).
Should they have been disassembled, it is sandwiched between the bottom
part and the top with the threaded portion. Some versions are held in
place by a circlip.
There are special circlip pliers used to remove and
install them.
Mounting the Audio Insulator (Foot) is a matter of threading it to each corner of the unit. There would be appropriate embedded nuts to accept them on the bottom. The threads also serve as an adjustment to even/balance the CD/DJ player.
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.