Remove end caps from the boom.
I recently removed all the components from my boom (Starwind 27) so I could paint it. I found that you will need to remove the end caps if you want to change the outhaul line if it is rigged like mine and I suspect the way mine is, is standard. I pulled out the entire works to replace the rope. I left the wire in place.There are two fiddle blocks inside the boom. The block at the tack end is probably fixed on a pin just inside the end cap (close enough to get your hand on it). This block will have the outhaul rope spliced to it. The block at the clew end will have the wire outhaul swaged to it. This block is free to travel inside the boom. The outhaul rope passes around both blocks (the clew end twice) before exiting at the end cap giving you 3 to 1 purchase (I guess, is this right?)Now just thinking about it, I suppose you could simply remove the end cap at the tack end and get that block out so you can remove the old splice, use the old line as a messenger and feed the new line in and then splice it to the block. You'll have to remove the tack end of the boom it seems.HTH, Scott