It's a while ago now but I think my set of "reproduction" door handles were the type where the pivoting bit of the handle didn't pivot, you had to manually push the square bit. If I remember correctly there was an extra "lump" on the plastic case that prevented the handle from pivoting. I removed the extra plastic lumps as I wanted the handles to work using the pivot mechanism.
Thought I'd discussed it on the forum but can't find the post.
Cheers, Graham