Phil
Firstly, are you sure that the jib furler is a 'Rotostay'?
I recently bought and (thankfully) sold a Trapper 500 with a Rotostay furler. On having the mast raised I discovered that the furler was siezed solid. The only sign of access to the unit was two holes on the lower face to take a pin wrench, which I had to have specially made. On using this water came out and the system freed itself.
I susequently found out that the Rotostay unit is integral with the forestay and both have to be replaced, at a cost of c.£850, and that the one on this Trapper was about ten years or more old.
If you would like the wrench I can post it to you,(if I can find it) from memory the holes are on about 52mm pcd and 4mm dia
There were no marking on the furler, and I discovered that it was a 'Rotostay' only by visiting a number of stands at last year's Sothampton boat show
Hope this helps
Frank Marsden
Now a delighted Superseal sailor
F Marsden