Hey lookee here:
http://www.cnczone.com/forums/showth...7&page=2&pp=15
Page down and MAX711 has springs on his big ole Industrial Hobbies 200lb mill head. He gives a picture, some notes on how well it works (some loss of travel but now he can use a little bitty servo and things are way smoother), and he also gives a part number and vendor to get one.
Best,
BW