David P Best: Replace the drain plug with low-profile elbow
David P Best: Elbow and pipe nipple fit behind change gears
David P Best: Pipe nipple connects to ball valve
David P Best: Plenty of clearance - low-profile elbow is key
David P Best: Oil drain system fits neatly behind the banjo
David P Best: Low-profile elbow is the key here
David P Best: Ball valve connects to reinforced flex hose
David P Best: Flex hose delivers oil to suitable container