Needle files were made for this. But they won't go in everywhere.
Gluing sandpaper down to sticks of various sizes will fit even more places.
The tiniest slits usually just have to stay. Just sand the outsides for 
any chipouts. Nobody can see inside anyway.
   yours scott

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    Scott Grandstaff
    Box 409 Happy Camp, Ca  96039
    scottg@s...
    http://www.snowcrest.net/kitty/sgrandstaff/
    http://www.snowcrest.net/kitty/hpages/index.html