I'm building my first fly rod and I have a newbie question about the attachment of the rod blank to the cork handle/reel seat. The cork handle is approximately 7 1/2" in length. The reel seat is about 3 1/2" After reaming out the cork hole so the blank can be fitted how much of the blank extends into the reel seat after it has been glued to the end of the cork handle? All the way to the butt? Half way(1"-2"?) If the rod blank doesn't extend all the to the butt what material is recommended to fill in the "space?" I hope this makes sense.

Thank you.