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OTC 6613 Variable Pin Spanner Wrench - Universal Design Fits Many Pulleys with Slots or Holes, Including Camshaft and Crankshaft Pulleys; Adjusts from 1-1/4" to 5"

OTC 6613 Variable Pin Spanner Wrench - Universal Design Fits Many Pulleys with Slots or Holes, Including Camshaft and Crankshaft Pulleys; Adjusts from 1-1/4" to 5"
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ansoni- posted on r/espresso5d

Just looked up the internals of the lever. If this is the issue, you will need a spanner wrench to loosen the piston to re-seat it.