Why don't you just buy one from Numrich - apparently they are still "in stock"
HARRINGTON & RICHARDSON
SELF LOAD PISTOL
Item No. 293200
Firing Pin Spring, .32 Cal.
Retail Price: $4.15
give you a tip:
When you are ready, and before ordering on line, go ahead and call their
TOLL-FREE ORDER LINE: 866-NUMRICH (866-686-7424)
... and somewhere into the call you'll get a recording giving you a "Coupon Code" number.
By ordering on line (only) and using this number, you'll get free shipping on small orders such as this one...
... and save yourself the $4.50 or so shipping.
Guess they figure that it's worth it since you are not "tying up" one of their reps.
They give these numbers out only during their normal hours (on weekdays 8:00 A to, I believe 4 PM Eastern time.