One or more of the canister base springs has come out.

Spring Replacement

If one of the Canister base springs has come away from the base ring the Spring will easily push fit back onto the raised section. If the spring has come out of the Main body of the canister base then the following sequence can be followed to replace it.

First remove the springs from the base ring carefully. This is necessary to give free access to the hole the spring must be returned to. Align the spring with the hole and twist it into the hole in a clockwise direction whilst pushing on the leading edge of the spring with a large flat blade screwdriver to guide the spring into the bottom of the hole.

Further Resources

Assembly & Testing Document