Notice:
The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
It depends on the brand, but it will probably just be a shortening job. It may or may not use your existing headstay or halyard, so the brand means a lot.
If it's a CDI Flexible Furler it would be as simple as reducing the size of the rubber extrusion by cutting off the excess. Can't speak to other makes.
I can't imagine one that could not be cut down but the brand AND model will determine how hard it will be to accomplish. Furlers are a very important piece of equipment, learning about them only takes a few minutes at the various websites. Basically; Harken works Best, Schaffer very high quality, CDI cheap but adequate and a particularly good match for a C-25 because of the internal halyard. All others are random also ran products. A new CDI is so cheap that $200 for a used one is just barely OK and that would be for one in really good shape.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.