Warning: a Rolleiflex shutter spring swap took me 11 hours because I refused to pull the front plate
I had a customer's 3.5F with a lazy 1/15 speed, and I was sure I could fix it by flushing the shutter without tearing down the front. Big mistake. I spent 11 hours over two evenings chasing that speed, readjusting tensions that were never the problem, when the real culprit was a tired main spring I could not even see from my angle. The second I finally pulled the plate and swapped the spring, everything snapped back to spec in about 20 minutes. So here is my hot take: on old leaf shutters, stop being lazy and pull the front plate first. What is the dumbest shortcut you have taken on a repair that ended up costing you a whole weekend?