I have not seen appreciable wear from an ascender used for climbing. Whatever wear there is is spread all over and not concentrated in one place. Used for clapping on a tackle, on the other hand, produces repeated strain in about the same place. Also, when climbing the load is just the weight of the climber and is not loaded in one place for very long. If I recall the other discussion, you had in mind a way of getting the ascender off once the halyard was up and tensioned but I did not really understand it. If you had to leave the ascender in place, I think that would be very hard on the halyard.
You can get 3:1 by having a block spliced to the end of the halyard such that when the sail is struck the shackle at the peak is easily reached and the block is just shy of going through the jib halyard sheave or block. That block has the rest of the halyard length spliced to the blocks becket and passes up through the block before going down. When the jib is nearly up, hold the halyard with one hand and pull out the bight that goes from the becket around the block and down. Plop the bight over an open turning block on the mast and then finish tensioning the sail.
G'luck
|