I have a question for those more experienced. I tried to drive the spring pin in this am.....and thought it might work better from the side with the counterbore.....the larger hole end. This is the lower pin on the gearbox. Pin did not want to start, so rolled over to the small side and it went in. I did not think to look closely when I had it in my hands. Does anyone know if there might be a shoulder or small diameter on the side with the counterbore.....or did I just not have it starting correctly. thanks