Removing trackball bearing dust caps -- standard procedure?

Xyla

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Removing trackball bearing dust caps -- standard procedure?

Hi,

I am rebuilding some trackballs with kits from Arcadeshop and the new bearings have dust caps on both sides. The old bearings I am replacing all had the caps removed on one side. Is it standard procedure to do this to all new bearings? The new bearings aren't totally sealed, and the lubricant I am using will soak in through the dust caps, but its kind of annoying.
 
I just rebuilt mine not to long ago. I uses a little wheel bearing grease. I figure it would work better in sealing out the dust and gunk that might get stuck in the bearings.
 
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