Just had a session and found some weird results..
Took my W&B 7/8ths & my brothers Westy Rattler.
I did , 1/5/10k Chosera / 16k Shapton Glass / Blue Green Escher (60 laps with slurry + 50 laps with water)
I used the scope to keep an eye on the westy and took the odd picture but after the Escher I noticed what looked like , me missing the very edge , so I added a layer of thin electrical tape to the thick layer I always use.
This had no effect .
The very edge was showing a micro bevel , if you will, caused by the Escher.
Why the Escher had not hit the whole bevel is beyond me...
Set up
Attachment 264787
W&B 5k (Beautiful)
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W&B 10k
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W&B 16k
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W&B Escher
Attachment 264791
Westy 16k
Attachment 264792
Westy Escher
Attachment 264793