My 331 has a similar arrangement to that which is illustrated in BG’s pic in that the mizzen boom is held up in the track by a pin inserted into a hole drilled in the track. When raising the mizzen pull up and secure the halyard, then remove the pin and pull down the boom with the cunningham, which is secured by a jamming cleat. The only tricky part is, when lowering the sail and lifting the boom, relocating the pin in the track, particularly if it’s blowing a bit. I’ve marked the position of the hole with tape on the mast, which helps along with swearing at it. I can’t imagine how difficult it must be to steer the boat safely without lifting the boom, so the effort for me is worthwhile.