It appears this servo has the same kind of dual side mounting lugs as the 94141 of which I once had some 50.
 
I could never see any sense in those top and bottom lugs. If you cut off what would be the top one, to screw mount through the bottom one, you would need a base thick enough to secure a screw. That base would take up vertical space. 
 
If you had rails on a base and used the top lug, the head of the screws would take up vertical space.
 
If  you removed one of the dual lugs for "right" or "left" mounting then the servo was rendered useless for opposite mounting. 
 
To me,  in contrast, single lugs centered on the side of the case, as on the Volz, makes very good sense.
 
Can anyone explain how the Airtronics dual lug system is supposed to be advantageous or utilized for mounting in thin wings?

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