Yes, sorry your answer updated on my first reply haha. I do want the cylinder section to remain a cylinder, which is why I am afraid to add any holding edges laterally along the cylinder (it doesn’t subdivide as a circle anymore when I do that or I am doing it wrong). I basically want a cylinder with nice crisp cut on the side that is completely flat and everything from that point forward will have flat/square features going towards the main pivot point Pin Hole on the right side.
Your updated reply looks much more like what I am after on the top “metallic”image.