Doing a 1973 727 overhaul like the one in the excellent write up on this forum. You seem to be well versed in the 727. Long story short, while the valve body was apart, the table was hit by a fork lift! I reorganised all the parts and in the end I am stuck on 3 very similar springs, one is painted light blue and according to the write up on here it is probably for the throttle valve. The other two are almost the same lenghth but one is a little heavier/stiffer. One old timer told me the stiffer one goes on the converter control valve and the other is for the shuttle valve, a valve body I saw today had the stiffer one in the shuttle valve and the converter spring was blue!! Can you shed any light on this?