I've run into the same difficulty lining up the two dowel pins. Try it on a 113 SL; what a pain. The problem is caused by the fact that the balancer turns very slightly as you draw it into position. The last time I did this on my 240D I purposely set it out of line and drew it into place, partially pulled it and drew it back in several times. Slowly but surely it lined up. I'd sure like to hear from the experts if they have a trick for this.