SCANGRIP Canvik Basic Instructions D'utilisation page 6

Conical Springs

Use the raised jaw 90.0060 to ensure that the centre line of the
spring is parallel to the compressing device. Do not use the coil
spring compressor for conical springs if this is not the case. Fit the
raised jaw 90.0060 at the spring end with the smallest diameter.
It is very important for your safety that the jaws are fitted
correctly and that the bolts are firmly tightened before use.
Ball Springs

Use the raised jaw 90.0060 to ensure that the centre line of the
spring is parallel to the compressing device. Do not use the coil
spring compressor for ball springs if this is not the case. Fit raised
jaws 90.0060 at both spring ends.
It is very important for your safety that the jaws are fitted
correctly and that the bolts are firmly tightened before use.
Conical Springs Ball Springs