I have an issue with my model: I'm making a blimp similar to the ballooncorn, and have used the exact same bone format and QC code. It doesn't work however: in preview it is at his feet and in source filmmaker it goes to his hip. The jigglebone is coming out of bip_head bone and has a jiggle_base and jiggle_1. The entire model is attached to jiggle 1.

Heres the qc code:
$jigglebone "jiggle_base" {
is_rigid {
length 500
tip_mass 15000
}

has_base_spring {
base_mass 0
stiffness 175
damping 20
left_constraint -50 50
left_friction 0
up_constraint -50 50
up_friction 0
forward_constraint -50 50
forward_friction 0
}
}