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I've started using a bore gauge to measure the bearing clearances on my F20C, however the gauge is leaving significant scratches on the bearing shells that can easily be felt with my nail. I've tried to be as gentle as possible but cannot seem to avoid this occurring. The scratches will not polish out like you suggested in one of your videos. Is there anything I can do to prevent this happening? Thanks
The bore gauge I use has small teflon buttons insert into the end of the two contact points. This seems to reduce the marking on the bearing shells however some amount of marking is inevitable. The marks I end up with can't be felt with your fingernail and are more visual than anything. If you're getting deep scratching then I'd be considering a different bore gauge.