For the mainsprings, you can see from the pics below that the Wolff spring (in the middle) does not match the original any better than the PP spring does ... I haven't installed them yet, but my take at this point is that they are going to be another suitable solution, but there is not an issue with overall diameters which at:
PP 0.218"
P64 0.217"
Wolff P64 0.220"
are essentially identical.
Stay tuned for more info ...
Saands
