Many Thanks Geoff,
My furling gear is with the rigger and he is 150 miles away but I think, from memory, it may be the smaller version.
The rigger sent me this a couple of days ago.
"We have had the following message from Z spars this morning.
Regrettably we no longer have this size of furling drum in stock. This has been discontinued and we are awaiting our new systems to become available later this year.
I have had a good look in old stock pile for the old plastic discs but have had no joy.
Sorry we cannot be of more help on this occasion."
So if you own a 235, and probably a 21 as well, and your furling gear fails in any way you've got an expensive problem!
Regards,
Robin.