I think this thread jinxed me. Took out new wheels today for a spin on new tubulars. Rear wheel is my first ever deep V rim. Coming home I ran over something and immediately flatted completely, felt impact metal to metal and then a hard object in the tire. Roofing nail. Through the tread, tube twice and back out of the inside of the tire, then through the rim bed. I had a full 1/2" of nail inside the rim. (God thing it was a deep rim and the nail no had nothing more it could reach.) Pulling the tire off, I had to disengage both the valve and the nail (which I left in so finding the repair will be really easy!)
So this brand new to me wheel now has another hole in the rim bed. It had 31 already so I'm not concerned. (28 spoke holes, the valve and three at the joint - weight balancing?