Migrated to: https://www.printables.com/model/534446-digicomp-i-actuator-bearing-boss-repair DigiComp I is an educational working computer in plastic, sold in the mid 1960s. My DigiComp I hadn't worked in decades because the plastic boss that holds the crank in place had split and broken - this is a part that takes a lot of mechanical stress. I built this part to hold a 2x5x2.5mm roller bearing (Amazon ASIN: B00TVPSCVO) and make the crank stand up and turn smoothly, transfer force efficiently to the cranked parts.