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shellplate installation problem

Am I missing a trick?  I just took out my SDB shellplate for the first time then I reinstalled it, putting the wire back into the center hole.  It now will not index forward correctly.  The catch that is supposed to pull it forward pushes the plate backwards before engaging, so the plate never makes forward progress.  It only goes forward correctly if I hold the shellplate down so that the catch will reset without pushing the plate backwards.  What do I need to do to fix this?

OK, found another post with the same problem.  Looks like the detent ball went missing, don't know how.  Fortunately I have a spare parts kit, replaced the ball and now the shellplate advances correctly.

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