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Down stroke stop 550B

Hi, my 550 started feeling "mushy" at the bottom of the down stroke. I noticed at the bottom of the down stroke, the stop system does not come into full contact. I can put a piece of paper in between the stop point and pull it out, without tearing it.
My question is, Does the 550 have to come in contact with the stop in the left link arm to stop the downward stroke?

It could be one of the dies is down too far, and stopping against the shellplate too early.

At this point, the tool head is not in the 550. And I'm still not coming in contact with the stop. I'm real close, but not against.

Look for a hairline crack in the underside of the crank.

Thanks, I'll look that that tomorrow. Thanks again

On the right link arm, I found a flattened out primer that was acting like the "down stroke" stop. I took it off and works great again! Thanks

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