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MacCulloch S550 Decompression Valve?

This saw does not have a DCV fitted and is now impossible to start. It has Atom ignition.
The head/cyl casting has a some bulk cast into it that looks like it it could be intended for a DCV but it is unmachined. It appears that the vent goes through the cyl wall about a 1/4" from TDC!
Is this Kosher? Has anyone seen a DCV fitted in such a way?
Qskeptic, January 2009