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Can you use a Post-it to measure clutch warpage?

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I've heard that you can measure the warpage of clutch plates by placing them on a flat surface and running a post-it around the edge, if the post-it slides under on one side but doesn't on another side it's warped.  Has anyone tried this method and gotten results?  Also how flat of a surface does it have to be and are there any household surfaces that would be flat enough (a flat table, etc.)?  I don't have any feeler gauges but i can pick some up if need be.  I'm mostly just wondering about the surface.

-Sincerely, Airborne 

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Your counter as long as it's laminate, finished and sanded wood, or stone should be suffice for a surface. You can also try a razor blade if you've got one. If not, the post-it should be fine.

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I've heard that you can measure the warpage of clutch plates by placing them on a flat surface and running a post-it around the edge, if the post-it slides under on one side but doesn't on another side it's warped.  Has anyone tried this method and gotten results?  Also how flat of a surface does it have to be and are there any household surfaces that would be flat enough (a flat table, etc.)?  I don't have any feeler gauges but i can pick some up if need be.  I'm mostly just wondering about the surface.
-Sincerely, Airborne 

Pane of glass is the flatest thing in most homes
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A post it can work but keep in mind...they typically measure around .08 and most warp specs are bigger than that.

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5 hours ago, ohiodrz400sm said:


That's a big Post It. I just measured one, it's .004"

Sorry..thats .08 metric which is a a little over .003".  I'm a machinist and can measure post its with high accuracy equipment...they are consistently closer to .003" than .004".

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Sorry..thats .08 metric which is a a little over .003".  I'm a machinist and can measure post its with high accuracy equipment...they are consistently closer to .003" than .004".

I know I'm messing around. My verniers I have at my desk are only required to be accurate within .002". It was actually closer to .0035". We buy the cheap Post It's, and verniers

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17 hours ago, lakeportmike said:

My equipment is accurate to .00006"...the actual post it reading is .003145"   :)

Can I borrow those... i've never been able to get an accurate measurement of ...something and I need to measure to a micron ... i'm making a tiny wiener joke 

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