I recently picked up a Model 457 in pretty good shape. It has one recoil spring, which I figured is normal. However, in reading an online article from 2000 (Up Close and Personal: Part 2: Recoil Springs and Recoil Control), the reviewer states it uses two, plus he shows a double spring. But the manual that came with the gun only shows a single recoil spring. So ... am I missing the second counterwound recoil spring? I don't want to shoot this if I am missing a part. Please only answer if you're sure. Thanks.