Window arm mechanism missing small part...

In the very bottom center of the first picture is the part missing from another window. It looks like a beige "snap" on end piece to a small rod that attaches pieces of the open mechanism controlled by a winding arm on the inside. The stainless steel piece adjacent to it slides and clips onto and secures it. Because it's missing on the other window, the steel piece slides freely allowing the bottom arm to detach from the upper arm, which disables the winding arm function on the inside. Can this tiny "snap" piece be replaced?

Thanks for the reply, close but not quite...
It's actually the beige colored circular "snap" in the above pictures that is missing. It is on all the functioning windows, but missing on the defective one. I will send pic if the defective window for comparison. You can also see where the "snap" is missing, the pin has begun oxidizing. Thanks again!