[CentOS] rsync

I've gone over and over the man page and I don't get it and it's
obviously a simple task

I want to rsync a directory but only the pdf files...

rsync -ncauv --include=*.pdf $WORKING $WEB_SERVER
# sync's everything, I want to exclude stuff

rsync -ncauv --filter='+ *.pdf' --filter='+ *.odt *.ott *.eps' \
$WORKING $WEB_SERVER
# sync's everything...does not seem to exclude anything

rsync -ncauv --filter='. /root/scripts/qm_manual_filter' \
$WORKING $WEB_SERVER
# cat qm_manual_filter
- *
+ *pdf

excludes everything

I am using -n for dry-run
I definitely need recursive but -a option handles that

Suggestions?

Craig