I recently finished installing the 1/2" oversize,(original are 3/8") Ruby cylinders I had gotten from Royce at Quisenberry Station. Naturally I accessed the Dave Hottmann "Ruby tune up", previous posting to finish it up! Wow, what a difference they made. My IDA took right off with 6 cars & then the same with 12! Also it runs real slow now, which is what I was, really, looking for!!! Now all I have to do is R.C. it. Thanks again Royce! Jim Spanier