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Ah Derek, I do indeed have a drawer full of such technical 'stethoscopes' but not one of them can detect the location of this irritating knock - Straight end, Phillips, even Ball Nose but not so much as an indication - yep - tried that but no result Believe me I have gone through everything short of isolating each cylinder from the other. I'm convinced it's the big end bearings but can't be 100% certain. Plan is to make new ones anyway then I will try one cylinder at a time. As you can see it runs very slowly - it has not a hint of a tight spot nor a wring so at this stage it is a tad perplexing.As always thanks for your input Regards - Ramon