Not smooth - Razer Lachesis 4000dpi Precision 3G White Laser Mouse 9-Buttons independently programmable ...

It should be taken to machine shop and resurfaced to ensure that it is flat. The smoothness is from wear surface should not be shiny.

If the surface is still smooth with no visible cracks, gouges, ridges, grooves, or deep impressions, or bluish tint indicating possible heat distortions, then yes, use a circular motion with the sandpaper. If you feel ridges or any roughness whatsoever when you run your fingertips around the flywheel's clutch disc face, then have it turned smooth by a machine shop. Any doubts at all about the surface, have it brought back to perfect smooth by a shop. Otherwise, clutch will slip and chatter. Turning it is always recommended, but not necessarily always needed. By turning, I mean the shop would cut and remove the surface to the lowest groove point and smooth it out from there. I have put clutches in without turning the flywheel at a shop, but I got a trusted mechanic's opinion first. His frank advice was, If it's on an older car, smooth is smooth.

you vehicle runs smooth morning , and starts running very rough after the engine start be hot .

if you look at the belt you have a smooth side and a grooved side and if you look at the pullies you have a grooved side and a smooth side,hence smooth to smooth and grooved to grooved.

Not fully understanding your question. You stated that the "head does tilt smoothly on 516. How do I get it smooth". What are you asking exactly? How to smooth out the pan as well, or how to make it tilt even smoother?

Fibreglass can be smoothes off with sandpaper and / or wet and dry paper.

Smooth paddle edges are better as they are less likely to absorb water

You didn't specify which type of smooth top - some, like the induction require special cookware. For the typical radiant type glass top nothing special is required.