Yes...in some of the YF models the metering rod arm sat parallel to the pump arm piece. This would have been the early models. And your 2100s could have been an early model or a late model. In 3 3211s carburetors I've learned 2 were early and one was late. In the late models the metering rod sat at an angle and was only supposed to touch at the rear (or far depending on your point of view) edge. How to know? How was it sitting when you first started? Parallel? Then I'd guess it is a reasonable thought it is an early model and you shouldn't worry about that. Not parallel? Maybe it is a later model. I wouldn't lose any sleep, though. If your pump rod and your metering rod are hitting bottom at the same time (and on the pump it may be that the small clip is what is bottoming out), you should be right where you need to be.
