Can you change the UJs by themselves?

I thought the F2 props and bearings were only available as a complete unit (so presumably the UJs are part of this).
 
Can you change the UJs by themselves?

I thought the F2 props and bearings were only available as a complete unit (so presumably the UJs are part of this).
Looks to me like you can as there's clips and all that and seen them listed for them just done know if some are good
 

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