Cam bearing a lifter question..

Absolutely agree. Scraping is a lost art and you can easily make things much worse. My father would scrape the crank bearings on 200+ ton metal stamping presses. Much harder bronze like material, but still interesting to watch. They also had an very fine abrasive paste they would coat the bearings in and run it the machine. They had a stand alone filter system to filter the lube oil and the paste was self diminishing. I use scotchbrite on things everyone say is a no no. Had no issues.