"PDCA (Plan-Do-Check-Act)" is a typical management cycle.Let's turn the PDCA with spinner!!Movie:https://twitter.com/kirin_nico/status/867017017110310912https://twitter.com/kirin_nico/status/867395541864390657Center hole:22mmFor ball bearing "608"Around holes:22.6mmFor weights : Japanese 100Yen coi…