In reply to jimtitt:
Jim, I and others I know have found it close to impossible to work out how to thread some of the rams horns in Sicily (San Vito area) which seem quite peculiar. Some are fine, others not. Are they mostly all your's? Rather than spending half an hour working it out, we had to revert to untying and threading them as with ring bolts, which seems to defeat the point. And, yes, I've used more standard rams horns with no problem.