Are they 440 or HD 440 from the pictures I can find on the net of the HD 440's the same kind of screws that hold the woofers in the cabinets are used to hold the tweeters in. If you don't see any screws holding them in then most likely the tweeters are glued in. You will need to careful and pry them out. With the woofers out you can use a mirror to see if any screws are visible on the inside of the cabinet that are holding them in.
If you have a plate around the front of the driver, holding it, remove that, and reach through the woofer hole, to push the tweeter from the backside. I don't recall my HD-440 drivers being glued in, but I have come across drivers that had gray caulking compound around them. This will yield with sustained pressure. Glue is a b***h to do anything with.
Thanks for the reply's, after reading these I tried to push them out from the inside with no luck. I ended up using a butter knife and slipped into the gap on the top between the speaker and the wood. With a little prying I was able to pop these out. The cross over board was very had as it is shot into the frame with braiding nails and glued in. Once I got the nails out, I used a putty knife to pry it out. Thank's Again!