wish I had read that before I installed my TE and Pitot sockets.....

Brad

It could easly be to support the TE tubing. Normally the tubing is
routed up from the mount and then back down through the fin. This
upward route is to prevent water from getting into the tube. If the
water has to go up as soon as it gets into the mount then it is not
likely to accumulate in the tubing.

Robert Mudd
Moriarty, New Mexico