Originally Posted by Maximo

Maybe microlap is wrong term then ?

And I would think machining to this tolerance would be very difficult and likely would have to be done in a temperature controlled environment.....I am not "machining" to goal size, but rather to desired fitment of piston to the sleeve.... in measurement I am removing about .0003" from an average piston give or take depending on brand... I will not get into the technique or tools that I use exactly, but it does work well, especially on engines that don't have very good fitment from factory.....