Rich,
I am unclear on where the fore and aft freeplay occurs on your 1900 but I assume it is when you begin to pull the toggle to the rear. I can only speak about my 1900 - the only one I have handled. On my 1900 there is very little initial resistance (compared to a P-08) until the toggle hits the ramps. I have never measured the spring tension but my impression is that it is progressive rather than the constant tension of the P-08 coil spring. I would also note that the toggle requires the inertia of the return stroke, more than the P-08, to return to battery. As for replacement leaf springs - start looking: I suggest that you buy one whether you need it now or not. An enterprizing machinist could do well making reproductions.
KFS
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