I'm curious about this thread.
Obviously with folding mast steps, a climbing system should not be needed. Only a Falling system (well, falling prevention).
I only lived aboard baby
boats. My mast on my last yacht was only 31 feet and my
antenna was about a foot from the top. I had no steps, so climbing was a whole other story, and the 26 foot yacht was anchored and swinging with the tide, so I'd hate to think how far I was moving at the top in a gentle swell.
Anyway, to make a long story longer, I needed to
repair the
antenna and had to make two trips up and down the mast.
In my
Emergency Services days we did a lot of vertical
rescue training which included abseiling. The
training involved abseiling down grain silos (no foot holds). And we did not have someone handling the other end of the rope at the bottom.
While double braid
halyard is not as safe as climbing rope, I have towed very heavy vehicles with discarded (worn) yacht lines. So I bought a couple of decent carabiners and whacked on my storm harness and worked out how to climb a smooth aluminium pole. I don;t have a bolt rope on the main so it was easy to have a couple of loops for my feet to climb and a couple of wider loops that clipped to my harness keeping me close to the mast as I climbed, and holding me there when I arrived.
Designing the climbing loops that fed through above the sail slugs and trying to be sure I could not get my whole feet through them was a whole other form of entertainment.
So at the top I did my business (well, it felt like I was about to a few times) and removed the antenna, then easing a wider loop through the gap to the next slug down I lowered myself one slug gap at a time, removing the loop above and feeding it into the loop below the one I had arrived at, then easing the halyard through the carabiner another foot.
I realised I had tools, but not the new antenna with me about 5 foot from the top of the mast! So I had to do the whole exercise twice.
With mast steps and a decent
safety harness, it should be fairly safe. I used the harness I got for moving about the
deck in waves over a couple of metres (but had always forgotten t0 wear until I realised I was in waves over 2 metres and the harness was below, at the other end of the boat).
If you haven't abseiled, check a YouTube video. You can brake or lock the descent really easily, and you probably don;t weigh more than 100kg (a couple of hundred pounds) so a double braid halyard is unlikely to break under your weight.
I certainly wouldn't want to do it too often, but it worked and because I am comfortable abseiling, it was not overly scary. I would NEVER try this with a BOLT ROPE
mainsail though.
I expect a few replies saying how foolish I was (plain STUPID might be more accurate) but I had been up masts before trusting myself to a bosun's chair (a hastily made plank with some old rope) hauled up using a spare halyard by less than sober crewmates when I was miles out at sea in a
race aboard a bigger
boat. So I have done sillier things.
And oddly, I felt safer with stuff in my own control, except for the worry of my feet going through the climbing loops and me ending up upside down, half way up a mast hanging by my footsies.