Newbie to the forum. Thought I'd share this video I found in case it's not in the forums, or in case you might not be aware of this cheap quick fix to the seat belt butler missing the belt.
Worked perfectly when I tried it, hasn't missed a beat since.
In case link does not work:
locate the exact spot where the butler extender grabs the belt - spary starch it and iron it like you would a shirt on an ironing board. As easy as that.