Vibration isolator pre-load mechanism

An apparatus comprising:

• a first quasi-zero-stiffness vibration isolator comprising:
• at least two single, separate disk spring washers, wherein each single, separate disk spring washer comprises an inner edge, an outer edge, and a central opening;
• at least one ring-shaped outer spacer having a central through-hole, wherein each outer spacer is coupled to and in contact with the outer edges of one or two single, separate disk spring washers of the at least two single, separate disk spring washers;
• at least one ring-shaped inner spacer having a central through-hole, wherein each inner spacer is coupled to and in contact with the inner edges of one or two single, separate disk spring washers of the at least two single, separate disk spring washers,
• wherein no two disk spring washers of the at least two single, separate disk spring washers are in contact with one another except through an outer spacer of the at least one outer spacer or an inner spacer of the at least one inner spacer;
• a bottom attachment portion configured to support the at least two single, separate disk spring washers;
• and
• a first top attachment portion configured to, with an application of a first downward force, compress the at least two single, separate disk spring washers;
• a compression fixture configured to apply and hold the first downward force to the first top attachment portion, wherein the compression fixture comprises:
• a bottom enclosure fixedly attached to the bottom attachment portion;
• and
• a top enclosure configured to move vertically relative to the bottom enclosure and the bottom attachment portion;
• and
• a second top attachment portion configured to, with application of a second downward force, additional to the first downward force, further compress the at least two single, separate disk spring washers.