The spindle was bumped up to 660 rpm and the Sherline's carbide insert tool with tip of 0.4mm radius was used. The cut was especially light with very slow feed. I was quite please with the result though it may not seem to be as nice looking as what DaveH showed on his ER25 Collet Chuck.
I made a trip down to Kelantan Lane the next day after finishing my appointment at the lawyer's office. As I was in a bit of a rush, I didn't check the item picked by the metal shop assistant. Realized that the aluminium round stock I bought is 120mm in diameter only when I got home. Looks like another trip is needed...
From this exercise, I discovered that to improve the surface finish, the tip of the insert tool needs to be angled against the stock such that the side is very close to the surface of the stock to be turned.
Once the gauge for the recess is done, I'll be able to carry on with my work to bore out the recess and drill the mounting holes.
That's all for now. Like always, be blessed.