Geoff wrote:-

>  
>
>>Hey Mike, figure eight is still the best,  it provides an even finish 
>>on the surface and  evens the wear on the edges  of the valve which 
>>will wear most  in the direction  it is "stroked".
>>    
>>
I'm guessing that the reason Mike suggested a linear movement was so 
that when rotated 90ยบ, it would be easy to see that the surface was flat 
if the cross grooves were present everywhere.  It would not be as easy 
to see if the scratches were in a figure eight.

royce in SB
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