The adaptor was made from a 3/8" bolt, drilled through the head to a depth exceeding the oil banjo position and cross-drilled at the appropriate point. The banjo was sealed using fibre washers and the oil was injected using a standard oil-gun. Care should be exercised to avoid over-pressurising the assembly.
The operation was useful in highlighting several banjo connections on the engine 'V' that required further tightening.