The #38 spring is to preload the cam, so the assembly doesn’t flop around too much when the #11 arm is released. For mine, I have the spring between #36 and #31. I think a spring in both locations would be an advantage.@whydontu If I understand correctly, I think the CX706 already has such a spring. See the following:
View attachment 42751
It doesn't show very well, but the spring (#38) and washer go on top of the clamping plate ((#36). I wondered if the spring was really necessary but I guess your experience suggests it is?
Craig