[DF] Crossbow Grapnel

[Nostri]

One of the players in my (Dungeon) Fantasy game is playing a halfling burglar and wants to purchase a crossbow grapnel from DF8. So far so good, I think he's got the cash and it'll certainly help at least him if not the whole party all at once but one thing neither of us can find is just how much cord comes with the spools or how much'll fit on it if he decides to upgrade it. Any direction to he answer would be great, thanks!