Just got back from an all day Demo with J Paul Fennell.One very interesting item he used to get his vessels thin, was a fiber optic cable that he held inside the vessel while turning.Tho he did use calipers as a reference,once the lite started 'glowing thru the wood'[it glowed red, like placing a light against your hand], he would continue until all the vessel was glowing.When it got passed around,i was shocked at how light it was,almost no weight at all.He had a sample vessel cut in half, that was consistently a 1/16".First ques....Any of you use a fiber optic lite while turning?...Next thing i noticed, while turning it looked like he was drifting right of center[hollowing inside]...then it occurred to me to ask him if he was turning it in reverse...and yes he was.He does not use a bowl gouge on the inside, only on the outside. He uses an assortment of of allen wrenches bent to his need and sharpened to only be used to the right of center and lathe turning in reverse...curious to hear how many use a lite to determine uniform thickness.... Thanks Rob