Think we had 5mm ish (where it went through a clutch), with the cover stripped off on the rest of the line. On an SR. Got a thrashing, and was fairly old (7years plus)and never broke.
Possibly originally set up by Booboo.
Always thought it might be a good idea to feed some bungy into the core for a couple of meters just to keep it a little taught when hoisting as a MH, can tangle using a MHO. Never got round to it.