I love it when the High Output Paraffin (HOP) Pin Pullers work as planned. Actually I had no clue what they were, so I did a little digging.
"The HOP actuator is the original product and heritage of Starsys, providing a very high force linear actuator from a very small package. The expansion of melting paraffin is used to create high pressure, which is then translated to either extension or retraction of an actuator rod. HOP actuators are used as pin pullers, or as a linear “pusher,” for either one time or for multiple use spacecraft mechanisms." http://www.spacedev.com/starsys_components_mechanisms.php
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