As promised....
I use a racers edge alu servo alonng with one of those flat head servo screws slightly filed down and an m3 nut to hold it all together.... works a treat!
As you can see there is ample clearance either side, you need the 5mm spacers on the servo to bring it forward to clear the servo mount.
Untitled by
Philcorner, on Flickr
Untitled by
Philcorner, on Flickr