A trick that I use, take a napkin or somthing like that, make a wad with it, but not tight, stick it in the hole, but not the whole thing that you loose it! just to cover the hole. When you start turning the crank, when it goes to the compresion stroke, you will see it POP out from the preasure. then see if you can have someone with a long rod or something and turn it very slowly until at TDC.
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-Mike H.