>>319
たぶんこれです
https://postfiles.pstatic.net/MjAxOTA0MDZfMTQ0/MDAxNTU0NTI3Mzk2NDg1.xSfHYPPqfsZx4--6PHCYteZy3gOXBuWlk091HzQ2W3Ug.tMSfaX0a8Yxyd0v7Pv5rp2kyonFlbO-6TIzbKbGVkyEg.JPEG.semi3697/IMG_6240.jpg?type=w773
https://blog.naver.com/semi3697/221506966886 (下の方)
https://wpbowling.com/ball-conditioning-machines/
https://www.starlanes.co.jp/starlane/morioka/proshop/zot.htm