IIRC, this was part of a planned cowl flap arrangement, that never got into production.
Seems to me that Dan Horton, Dan H in the forum, posted info about this.
Been a while back, try searching for it and reset the search time line to any time, default is 1 year ago.
Did a quick bit of searching, found this
http://www.vansairforce.com/communit...0&postcount=14
Good luck.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."