Seems to me that attempting to get yours working is the best first step. Can you raise it manually with your fingers or a small screwdriver? Remove it, inspect it, clean it, and don't forget that it is the magazine that actually makes it all go, so even the magazine needs to be examined.
I haven't seen the Sarco parts but they are generally a bit rough and requiring fitting anyway. You will not save any time, or money, by immediately going to the Sarco part.
dju
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