On 13 August 1943, "Krait" left Thursday Island for Exmouth Gulf, Western Australia, where it was refuelled and repairs were undertaken. Not only did the repairs cause delays in departure, but the folboats, manufactured by Harris Lebus and designated as model MKI**, which had been specially ordered for the attack by Lyon from England only arrived at the last minute. They were found to be faulty, lacked some important parts and were not according to the design that Davidson had specified. They had to undergo many on-the-spot changes simply to make each framework fit together and then fit correctly into the outer skins. This left the crew little time to get accustomed to them before being loaded on to "Krait".