Correct, you do need access to the underside of the kayak surface. However you might be able to get away with blind mounting if you use special third party blind mounting nuts; they just need to have a #8 thread pitch since that is the largest size screw that can pass through the track holes. Another alternative to drilling down would be an adhesive track option: www.rammount.com/part/RAP-398-BLK-TRACK-AU
Excellent. Just what I need for my campervan
Great product info and HowTo. I also prefer hand tools to 'feel' if everything is tight without breaking anything
So you need access to the inside of kayak with this system? Only for sit in and not sit on kayaks!?
Correct, you do need access to the underside of the kayak surface. However you might be able to get away with blind mounting if you use special third party blind mounting nuts; they just need to have a #8 thread pitch since that is the largest size screw that can pass through the track holes.
Another alternative to drilling down would be an adhesive track option: www.rammount.com/part/RAP-398-BLK-TRACK-AU