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Ah, I took a second go at it today and lapped the proper side of them. Took about an hour to do all four which included lapping each twice and then putting a slight angle on the very edge of each...

lol
:gth

So I had always thought the side you could see the identifcation marks through was the side you honed on. Well I suppose my base is perfectly flat now. :roflmao

Guess I'll give it...

It was about 20 - 25 minutes or so each, I was lapping the right side the clear face of it and I was using a 1k shapton. I lapped four, so it took about 1 hr for two each time I lapped them.

I did end up having a bit of a problem. My hones that I lapped feel really smooth after lapping them, I tried setting a bevel on one razor last week and noticed no swarf was coming up at all and I...

That makes sense. So the DMT is about .025mm (= .001") flatness and GDLP .001mm, so the question is 24 thousandths of a mm really perceptible?

Edit: Maybe makes more sense in terms of...

Really.. hmm when I was lapping them I noticed that I could look at the shapton from the side and see a low spot near the middle where it curved downward.

Hmm... duno, well they're all done now. The grid-lines went away fairly quick in a few spots on the shaptons but in other spots it took longer. It was pretty similar for all four of them as far as...

Well my 4k and 8k are lapped now. It took about an hour to do both, a little less than 30 minutes on each. I noticed the high and low areas on all four shaptons were in pretty much the same spots. ...

I got my shapton stones the other day and tried lapping them today. I bought a 1k, 4k, 8k and 16k shapton ceramic on tempered glass. I lapped the 16k and 1k today on my DMT D8C. The lapping went...