Update...the captive cotter pin moves upward but won't drop down at all. I've disassembled the clutch and as suspected the clutch cork was destroyed. It wasn't attached and it had broken into pieces. The spring still has plenty of tension and the and the inner clutch cone looks ok, but I'll let the experts make that call. I'll post some photos later once I manage to get the main clutch body off the engine shaft. Damn that captive cotter!