I wouldn't worry about WD-40 being in the frame. The bearing's seal is stationary at it's outer seat. So there would have to be 3/8" of standing fluid to get to the seal seat against the rotating axle. In fact I hope some one did spray something inside the frame. More likely what you saw is the slurry of rust/grime and water that gets in a frame no matter what you do. The eccentric is usually held during the timing chain adjustment with a classic pin spanner, although I've used any number of things stuck in the side holes and a lever against the pin "tool" and the axle to rotate the eccentric. The eccentric should be removed and cleaned off then lubed before reinstalling. BTW don't go and tension up the timing chain too much. It will have tight and loose points as you spin the timing cranks. Pick the tight point and have the chain a touch loose then. Just like a coaster brake or fixed gear set up. Andy (who just did this all to his CoMotion).