In an exploded view configuration, I have a simple training assembly I am working with to get up to speed on exploded view drawings.  It's just a plate with a tapped hole, a washer, and a bolt.  I "exploded" the nut and washer straight out on the hole's center axis.  When I try to add explode lines, it seems that they always want to jog all over the place for no real reason instead of just being straight lines along said axis.  How do I make a simple, straight explode line?  Thanks.

SW2013 SP 5.0