Originally Posted by CaptainForce
I'm surprised that they were still making them in the 90's. I've had 1973 boats with this feature since 1973, but I never use this reefing system. You likely have no need to "immobilize" anything. Just set up the slab reefing.
You are probably correct there. I'm also a bit surprised they were still being used in the 1990's. I'm just going on the visuals and that boom doesn't look big enough to house a mainsail inside.
You can achieve this without immobilizing but in the past I've found it preferable to be able to lock the boom. In fact if memory serves I think I installed a completely new boom - mast fitting. Probably not necessary except, and again from somewhat hazy memory, the original was badly worn and looking set to fail.