There is a thread from 2015 on page 2 of this forum about the same problem started by forum member bvil. Beyond the lack of recess did you check for fit in the cylinder? I ask because bvil's needed to be filed to fit along with the recess issue. I guess that is what Numrich means by "final fitting required" on their website specific to this part. You might want to PM bvil for suggestions on how this was handled.
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