Heres a crappy picture of one one of the towers in the pair I did. Now... around the midrange horn, theres little gaps as in photos below:

I was thinkin bout getting wood filler, putting it all throughout the gap and then sanding it all over smooth. But then I wouldn't be able to take the midrange horn out, and I do want it to be removable.

What should I do to hide those gaps so it looks nice, but still be able to remove the midrange horn?

BTW: Its not air leaks or anything worrying me, because the tower is sectioned and the 15" driver has its own seperate section. It's just aesthetics.