Misery loves company and I must have penance to pay. Four flats in the last week and a half after many years and many bikes without any. Recently put together my first vintage Italian, a CBT Italia with all Campagnolo components including the first set of 27” wheels that I built. New Gatorskin tires with Conti tubes and it rides like a dream. The usual ride is a 15 mile loop around a lake and less than a mile from home, the rear lost air. Walked home and inspected the tire only to find a pin hole leak at the edge of the stem support material. Popped in a fresh new Conti and went out for another seven mile ride, excited for the new build, only to find myself walking back for three miles due to the rear again. Once home, I found an outer pin hole leak nowhere near the stem and no obvious culprit. After thoroughly cleaning the inside of the tire, inspecting the spokes, rim tape, and installing yet another fresh tube, I went out the next day for a twenty miler. This time, I brought the pump and a patch kit. At mile fifteen, the rear lost air again! My wife just happened to be driving by so instead of doing the repair on the road, she drove my sorry butt home. The next weekend, I patched all three tubes but installed a Michelin 27x1.25 thinking that either I received a bad batch of Conti tubes or the 700c tubes weren’t compatible with 27x1.25 tires. Wouldn’t you know it, the Michelin went flat with a pin hole leak once again at the edge of the thicker material near the stem. I have a set of Araya tubular wheels that, although aren’t “period correct,” may just end up on the bike. Does anyone know the prayer, sacrifice, or bribe to end the cycle?