The cam on the white metal recoil spring Patriot replacement windows I don't know if I can replace just the cam or the whole unit

A quick learner from Springfield Massachusetts says:
The cam on the white metal recoil spring I don't know if I can replace just the white metal or if I have to do the whole unit but I did buy the L piece for the window that goes into that on another window
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Bob from SWISCO responded:

This looks like a 15-192 Pivot Shoe. I'd just make sure the new cam matches your old one, it's a bit tough to tell from these pictures. See the video below. 

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SWISCO S170 and S171 Coil Balance Assembly
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How to remove window pivot shoes
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