On the back of the indicator/headlight stalk you will see two bridge points (circled in red) these need to be filled with solder as seen in my picture. this enables the low beam to stay on as the high beam is switched on, it also leaves the low/high beam lights on their own seperate fuses and relays so you dont run into other electrical issues.
This is the other side of the stalk if you want to pry it appart, the hardest part of doing this is cleaning away the lubricant and getting the solder to stick.