May the 4th and xGen animation

​​​​​​​Today being May the 4th a.k.a. Star Wars day I wanted to have some fun and make a small simple animation with xGen using loops to have the blade going out of the hilt. However I don't know how to force a full recalculation of the geometry (if it's possible) at each step of the loop. Currently only the extremity point is visible but the other geometries based on that point are not visible until the loop ends.
Any ideas if it's possible and how ?
#maythe4thbewithyou

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I can still do a render anyway (I cheated because the blade is a solid body with a material but it could be the xGen publication added to the body).