You really need to provide a photo and some more details. I believe the Goiot brand has changed hands a few times.
Anyway ...... mine was purchased 1984, and is for an 8mm forestay. It is an open drum made of cast-aluminium, and the foil is about 2" diameter with twin grooves. If similar, then this may help:
Separate the top and bottom sections of the drum castings by undoing 3 (or 4) set-screws from the top. (These may well be seized if they were never correctly assembled with sealant, so may need a long soaking in your solution of choice). Slide the top casting along with the foil up the forestay. You should now have enough access to undo the sta-lock fitting from the bottom casting. I assume you will be renewing the forestay, so at this point just cut the wire above the sta-lock fitting.
(If your Goiot is similar, I do have the instruction leaflet)
Vic - many thanks. That sounds like a solution. There are 4 screw underneath the drum on this one but I hadn't realised that the drum was 'split' until I removed the furling line!!! Will give it a go this week-end.
Yes, my mistake. I was LOOKING at it from 'underneath' when I last dismantled it! BTW, on mine the sta-loc does NOT use the usual separate conical former ... the former is integral with the lower part of the drum.
Vic - all went as you described. One bolt the head sheared off but it was easy enough to removed once the drum was split. Do you have any information about the lower fitting? Not sure I want to dismantle it at this stage but would be nice to know how.
I have one of these and some ancient documentation - maybe in French... but if you can't get English info PM me and I'll tell you what I've got. Mine dates from the eighties and I've stripped down the bottom drum (no problems upstairs)
I took mine off the boat and messed around with so many corroded screws and bolts that eventually I gave up and binned the whole lot. ( well it's lying up against the side of the shed in Aktio Yard ) The top and bottom plastic bearings were worn through and the aluminium parts were worn all over as well. The forestay had probably not been changed in over 20 years.
Wasn't worth the effort to try and salvage either a 25 year old furler or a couple of hundred quids worth of forestay!