YYF Grind Machine Maintenance : Throwers
YYF Grind Machine Maintenance. Close. 1. Posted by. u/ParadoxWolf. 5 years ago. Archived. YYF Grind Machine Maintenance. I just picked up a Grind Machine, and I love how it plays, but there is one thing that is confusing me. I''ve never had a yoyo with hubstacks before is there a special way I need to take this thing apart for bearing lube, etc?