Nev,

I think your assumption is correct - that has been my experience with other SM wing tank pylons. Just a word of caution with the actual mounting positions; whilst you may find hardwood in that position, you can never tell if you are maybe on the edge of it or not. I normally open it up (round 19mm hole) and glue a 19mm round dowel up to the top wing skin. I then drill and put a plastic wall plug (like we use to hang pictures with) in the correct position on the dowel and use a long wood screw to hold the pylon on the wing. The screw head is countersunk into the pylon so that it does not interfere with the tank. Everytime I fit the pylon, I first turn the screw anticlockwise to 'feel' for the thread that the screw had cut into the plug. That way you don't cross-thread the plug. This method allows for an easy 'pullout' if the tank should ever get caught somehow and will then not 'break out' the pylon mounting in the wing.

Cheers,

Jan