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