I had to take the door handles off my kitchen door last night as the inner mechanism wasn't working, and needs replaced. However, the bit that houses the snib isn't coming out (see picture). Would I be better to keep it in and just buy the new handles, or start again with a new set - and if so how would I remove it: it only comes out as far as you see in the picture, and then just springs back. I can't find any information about the housing for the snib anywhere online...