Something like this
http://www.televue.com/engine/TV3b_p...t#.U0JqCKiSySo
Click on the camera icon for a close-up.
There is also the balance aids.
http://www.televue.com/engine/TV3b_p...l#.U0Jq7qiSySo
Again click on the camera icons for close-ups.
BINTEL could order for you.