The retaining spacers provide additional inter-board bonding between an Overo COM and an expansion board. These spacers can be used in applications of high mobiity and vibration. Results from a Gumstix customer testing to the US MIlspec for constant acceleration have been posted here.
Four spacers can be mounted on each Overo COM: one in each corner,
Gumstix supplies four retaining spacer with each Overo COM purchased at www.gumstix.com. Retaining spacers must be listed separately in a volume order.
The spacers can be purchased in a 50-pack in the ACCESSORIES section of www.gumstix.com, linked here.