Re: 1cm
Back to the original question... merc 4-in? Since you say you run it up, that means it's not stuck. So, pull a plug, and measure the stroke. I think it might have been Ron that posted long ago, regarding using a large zip tie (or other flexible 'something', like a cable.) I'll let others elaborate. Should be able to tell if it's 3.75 or 4.00
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