T500rs Bearing & Tensioner Mod?

Looking to do a few mods to my venerable T500rs to breath some renewed life into it. I've seen a good few videos regards replacing the T300 and T150 ball bearings and tensioners with metal components which they say improves the wheels feel.

Is this something that can be done with the T500rs or are its bearings and tensioners already metal not plastic as in the T300 and T150?
 
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