When I push my canister down into the canister base one or more of the 5 catches does not lock into the groove.

The catches normally require replacement at 200 dive hours. If this problem occurs prior to this time period a new set can be ordered from Avon Underwater Systems. Note. All 5 catches must be replaced, NOT just the one that is not locking into the groove.

Further Resources

Assembly & Testing Document

Video Link: Canister Base Catch Replacement