Shimano Altus 310 Acera 360 Rear Derailleur Upper Pulley Replacement

8speed upper pulley replacement for Shimano Altus M310, Acera M360 rear derailleur. Fits 608/626 ballbearing. To use it with 9 speed chain you need to scale it in slicer or scrape it with knife after printing. You can use steel bushing from acera as insertion for 608 bearing. No bushing works great too. Use sharp knife for decreasing thickness of teeth to fit your chain freely.