Oops!
Because things were still not very good, I decided to remove the inner G/B cover.
JulianS, I'm so glad you mentioned the K/S stop, the dowel was in my box of stuff to fit imminently.
Now that the stop is fitted, everything is ok.
I can now fit the proper spring.
I see now why the plate tag will not be at 12 o'clock.
It will be around 4-5 o'clock.
Thanks for all for your input chaps!