I have mentioned in the past a method that I devised. Tie a long piece of thread through the hole in the clevis pin. Tie the other end of the thread to a piece of thin flexible wire. Poke the wire up and through the clevis pin hole in the pedal, pull it through with the thread, then pull the pin up to the hole by the thread as far as you can get it. Then use a screwdriver or your fingers to maneuver the clevis pin through the hole. The thread allows you to apply some pull once you get it aimed. My pedal box was mangled from a PO who had similar problems and must have taken out his frustrations with a hammer and pliers. And I still couldn't get my hands up there easily.