I don't own a Carvex....but if it's like the trion, get the chip guard started and with the jigsaw vertical, chip guard against a piece of wood,
turn the jigsaw on and press the saw down towards the work surface. this should push/force the chip guard towards the blade of the jigsaw.
Hope that makes sense.
If all else fails.......a 5 pound hammer works! [scared] [eek]
Eric