I’m interested in this subject too. I recently lost one of the black rubber/plastic covers from one of the ‘sticks’. I’d hate to think it was gouging the mast!
I also have never seen these devices on other furling systems.
Maybe I need to get up there and wrap it in some self-vulcanising tape, or heatshrink sleeving??
Presumably Maud can supply new sleeves and sticks.