Hi,
The ejector is simply a notch cut in the upper part of the slide hold open lever. It's easy to see, even with the barrel in place. With the slide locked back, just look through the right side between the breech face and chamber.
On the early M41s, this notch is very much towards the rear. On the later M41s the notch is approximately in the middle.
Attached is a photo of the old style part, with the notch close to the rear.
Personally, it's my opinion that this part is one if the weaknesses of the M41 and is a big contributor to it's reputation for unreliability. S&W, in the process of copying the Walther Olympia, should have used a separate ejector.
But, too late to change that. It is possible to tune the ejection by slightly bending the ejector tab upwards to achieve an ejection that is straighter to the right. If you try this, I suggest buying a spare part to work with. You may have to dress down the top edge afterwards to keep it from dragging on the bottom of the slide.
Best Wishes,
Jim