IFF Spring Type 4 Blue

Additional spring for pantograph.

Spring usage:
Without spring: From 0 to 4kg (8.8lbs)
Type 4: From 3kg (6.6lbs) to 8kg (17.6lbs)
Type 4 + Type 4: From 8kg (17.6lbs) to 14kg (30.8lbs)
Type 12: From 9kg (19.8lbs) to 16kg (35.3lbs)
Type 4 + Type 12: From 13kg (28.6lbs) to 18kg (39.7lbs)