I think there is some confusion on the thickness here. Some people talk in gauge, some people in decimal. Just to clarify, here is a gauge/decimal chart:
18 - .0478
19 - .0418
20 - .0359
21 - .0329
22 - .0299
23 - .0269
What thickness do YOU guys feel the lip should be made of? The 'sample' I have is 21 gauge.
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