I've been using a Spinlock (with alloy jaws) on my 18Sq for at least two years, I guess it's been.

I'm well pleased with mine. I don't think Spinlocks will last if not well cared for, so don't drag it about, get sand in it, or forget to rinse after sailing.

But I like my Spinlock. My husband got one for his birthday for his Square and he likes his Spinlock too...

sea ya
tami