Sebastian Domingo <<nlrsystems>>
writes:

Pulley is found on this site:
http://shop.sdp-si.com/catalog/product/?id=A_3Z53-ML3976

Head pulley set up. 10 lb pulley basically keeps your head in a upright position
when your totally relaxed. Fully supported. Resistance is present to look down
and left to right. The 5 lb reel feels like it just relieves the load by 1/2 to
2/3.

http://dpk3n3gg92jwt.cloudfront.net/domains/designatronics/pdf/81015045.pdf