Britax safe-n-sound Instructions For Installation & Use page 41

If the car's child restraint anchor fitting is behind the vehicle seatback you may need to use an extension
strap as part of the top tether installation.
IMPORTANT: If using an Extension Strap, positioning the attachment clip above the child may lead to
injury in an accident therefore make sure that the attachment clip is not positioned in front of the vehicle
seat. Use a shorter extension strap or no extension strap.
Attachment clip should not be in
front of the vehicle seat.
It is normal to have some sideways movement if the headrest end is pushed from the side. Ensure that
the seatbelt is tight and the slack is removed from the tether strap. If the tether strap is over tightened, the
angle of the child seat may be affected.
IMPORTANT :
The top tether strap must be fitted at all times when the restraint is used in the car when using either
seatbelt or ISOFLEX installation.
Always secure the loose end of the top tether strap to prevent it hanging out of the car or being
accessible by the child.
THIS RESTRAINT IS NOT SUITABLE FOR USE WHERE THE TOP TETHER STRAP MAY FALL
INTO A SPLIT IN THE SEAT BACK OR OFF THE SIDE OF THE SEAT.
ALWAYS ATTACH TOP TETHER HOOK AND REMOVE SLACK IN THE TOP TETHER STRAP.
HOW TO INSTALL TOP TETHER
Attachment Clip
Attachment clip should be
behind the vehicle seat.
Extension Strap
The stabilising bar
does not need to
contact the car
seatback.
Instructions for Installation & Use
41