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I'd measured the bore earlier and found it was most likely 40mm, and so ordered
an appropriately-sized single-lip seal. The bag it came in, I was happy to see, had
the proper dimensions for the seal groove- 40mm bore, 32mm ID, 5.5mm wide-
so it was easy to cut a matching groove in the piston. I placed it about 1/4" higher in
the bore than the outlet port, of course so the seal wouldn't try to pass over the hole.
The 'step' is approximately equal to the height of the port, and allows oil flow to it.





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