Not all S&W Hand Ejectors have that feature. If it bothers you too much, sell that piece and buy a New Century.
Howdy Again
Learn Something New Every Day Department:
I have several Triple Locks, but I never noticed before today that there is no 'dent' on the recoil shield.
The 44 Hand Ejector, 1st Model, also known as the New Century, but affectionately known to collectors as the Triple Lock, first appeared in 1908. The mechanism to lock up the cylinder was quite different than the earlier Military and Police revolvers. Without going into great detail about the '3rd latch' we will just notice there is no 'dent' on the recoil shield of this nickel plated 44 Special Triple Lock that left the factory near the end of production in 1915. Note the profile of the recoil shield is flat.
Here is a view of the recoil shield of this revolver with the cylinder removed for clarity.
The design of the extractor rod on the Triple Lock was significantly different than any other (that I am aware of) Smith and Wesson cylinders. On this model, the extractor rod did not protrude out from the rear face and ratchet teeth of the cylinder. Instead, it was normally slightly sub flush, as can be seen in this photo.
So when the cylinder was closed, there was no need for a recessed track to compress the extractor rod as the cylinder closed. The rod was already sub flush, and there was a slight amount of clearance between the ratchet teeth and the recoil shield as the cylinder closed. When the cylinder closed completely, the latch at the front of the ejector rod pushed the rear portion back into the hole in the frame, locking the cylinder in position.
The 44 Hand Ejector 1st Model (Triple Lock) was only produced from 1908 until 1915. When the 44 Hand Ejector 2nd Model appeared in 1915, it lacked the distinctive 3rd latch of the Triple Lock.
The design of the cylinder reverted to the style of the 38 M&P, with a spring loaded ejector rod protruding out from the cylinder, which needed to be compressed as the cylinder was closed, no different than any other Smith and Wesson revolver with a swing out cylinder.
Thanks to StrawHat and The Glockodile for making me look into this and expanding my knowledge of Smith and Wesson revolvers a little bit.