What is the motor shaft diameter?

[Bryan_Pollock]

I found the conversation.

Where do people get #25 sprockets?

I ordered the four sprockets (two drive sprockets and two idler sprockets) from eBay last month, and they finally arrived today. However, they were completely unsuitable. The drive sprockets don’t have set screws, and the idler sprockets are asymmetrical. Where do you guys get your sprockets from?