Found corrosion between the rear beam traveller support and the carbon beam on my A cat. Cleaned up the aluminium bracket and reriveted only to be told to drill out the rivets and put washers inside the beam crimped onto the rivets to spread the mainsheet load. How do you do it, especially solo. I bought a Usb cable camera which i shoved inside the beam then tried fixing washers to a plank and holding up to the rivet tips to clamp down when the rivet gun compresses the head. Lots of misses and retrys. In desperation used a string thru a thin straw screwed onto a bolt thread and successfully dragged the washer and bolt through the beam and out of the hole. Next problem, how to tighten the nyloc nut without stjffing the thread. Suggestions?