I'm not sure what you mean by taking the boom apart. However, your problem should be fairly easy to fix, knock on wood. And for most of it, it's easiest to accomplish, for first timers, with the boom resting on a couple of saw horses on land.
One note of caution, & you'll see why, below. - Prior to withdrawing any line from the boom, make sure that you can pull on both ends of it & that they run freely (aside from friction due to crossing other lines inside of the boom).
- First, put a Reeving Splice into one end or the other of each line in the boom, as seen here, about 1/3 of the way down the page APS: Rigging and Splicing Services
They're simple to do, & eminently handy.
- Then tie a piece of 1/8" - 3/16" cord, about 1.5 times the length of the boom to each line running through it via the reeving splices. And pull the full sized lines out of the boom.
Which will simultaneously pull the thin, leader lines above, into the same snarled up positions that your reefing lines & such, occupied moments ago.
- With only the thin leader lines now running through the boom, you should be able to sort out what you want where (sans having crossing lines), using at most a curved piece of wire coat hanger or two & perhaps some needle nose pliers/vise grips.
Oh, & a good flashlight so that you can see the lines inside of the boom, & ensure that they're no longer crossing when you're done manipulating them.
*** Just don't let go of any of the lines such that their ends disappear up inside of the boom. Or you'll be standing it on end, with washers & fishing
weights on a thin piece of line hanging down the boom's insides, & a wire hook, re-leading the line that got away from you. ***
- Re-attach your reefing lines/lines that run through the boom, to the leader lines, & pull them into their proper positions in the boom. Making sure to put good stopper knots on the clew ends of the lines.
- Put the boom back onto the mast
, & run your lines to your preference, through your deck hardware
Of course, I also strongly recommend the following:
- Labeling the various line clutches, exit/entry slots, sheaves, & hardware on the boom, as well as on deck, with what each line is.
- Color coding your reefs
& various other lines. Particularly making sure that the reefing lines for each reef, match color wise at both the tack & the clew of each.
- Also, when you have the full sized lines out of the boom it is a good time tor run your fingers; in, around, & over any entry, & exit holes in the boom, as well as the sheaves & sheave boxes too, feeling for burrs or sharp edges. And when/if you find any, do the obvious to them.
Many times, on older boats, there are a plethora of these to get rid of, as one or several of the previous owners may have used rigging
wire, as part of a wire to rope
spliced system for reefing, or other boom ended controls.
NOTE/WARNING: You may see/have a line which exits the boom's underside, or port or starboard side, & is connected to a multipart purchase
inside of the boom.
It's most likely the outhaul. And if you're at all uncertain about either what it is, or how to rig it, DON'T MESS WITH IT - Go find someone with a bit more experience to tune, or re-lead/re-rig it.
As, it's a multi-part tackle, which at some point dead ends inside of the boom, as well as the rest of it's parts
residing in there. And if you lose the tail of it, or any of it's associated lines, then yep, you'll DEFINITELY be taking apart the boom in order to sort it out.
Said system (the Outhaul) may also consist of a hydraulic cylinder affixed at one end to a pin inside of the boom, up near the gooseneck. With a line running aft from there, the length of the boom. Then, over a sheave at the boom's tail end, & led to a track/car on top of the boom at the boom's clew end, or just to a shackle which attaches to the mainsail's clew.
Regardless of the hardware which may, or may not be involved with one of these, again. DON'T MONKEY WITH IT IF YOU'RE UNSURE. As if you goof, it could be messy (VERY Much So - thanks to the hydraulics), & or a situation again, where if you screw it up, you'll be disassembling the boom in order to re-rig it.
Heaven help you if you ever blow or detach a hydraulic line & have it discharge onto the deck. Particularly if you're sailing at the time. THAT is one of those events
which you recall
EDIT: And as usual Ann T. Cate seems to have typed up & posted the simplified (Normal) way to accomplish this task, while I was creating the complex, Tome like, explanation for things. Ah well: What will be, will be.