The hand brake mechanism changed in August 55 for the 56 model year, prior to the change the handbrake lever operated a push rod that ran through the tunnel to the point where the handbrake cables terminated behind a cover on the frame head.
On later models the handbrake cables terminated on the handbrake lever itself.
It's a long time since I've done it, but to remove the lever from a pre Aug 55 car I think is a matter of removing the gudgeon pin and disengaging the lever from the operating rod.
Jon, Rattletrap currently has a post August 55 Chassis so will have the later type of mechanism.
Mike
July 1957 UK supplied RHD Oval. 1972 World Champion Beetle. 1978 UK supplied RHD 1303LS Cabriolet. 1973 UK supplied RHD 1303s.