In Reply to: Original Cylinder Versus After-market posted by Kimberly on March 27, 2019 at 12:18:24:
I cannot tell from the picture, but the one on the right looks like the one on the old cylinder I took off mine when I replaced it with a new one. I was able to find it in a scrap pile late this afternoon. It is a cast dimple and could not have been made with a grinder. It measures 1" across, 1/2" long, and is not very deep. I am guessing 0.035" - 0.040", anyway less than 1/16". Nothing ever hit it in operation.
The left cylinder in your picture looks more like the one I bought new which did not have any dimple after grinding.
Hope this is of some use to you:-)