Hi Dave, there are 2 basic sizes of dovetail and saddle, the wider losmandy or D style, and the narrower Vixen style.
I thought the NEQ6 mounts came with two saddles? If it did you could change over to the vixen sized saddle by unscrewing the 3 grub screws just below the saddle which is currently on the mount. You can see how the saddle is removed from a similar HEQ5 at this link (7th and 8th pictures on the page):
http://www.astro-baby.com/heq5-rebuild/heq5-d1.htm