[Cruiser]

OK, the surface was ground to true it up and diminish the peaks and increase the surface contact area. A perfectly ground surface looks pretty but is not as effective at carrying oil past the whipping area of contact. The fact is that the residual milling marks or imperfections will work to your advantage by carrying the oil into the friction area and holding it. Eventually you will see a full contact patch form with use and these swirls will disappear, then you will have some longitudinal wear channels which will hold oil. This will take a very long time to happen. what you got is a good machine and it will serve you well for many yrs to come. Rest easy, use good slide oil, and use the machine ! In your photo i believe I could see the start of the wear track forming and it is nice and even while fading out at the end of travel. This is normal and good, as it wears in it will slow down in the rate of wear, right now it is breaking in. Once it is broken in it will hold for many yrs as stated above and then it will go into breakout mode, but by then you won't care or be worrying about it. If you had ever watched a hand scraped machine break in and wear over many yrs you'd know what I am trying to tell you. Basically, cast iron is soft and malleable but as its friction surfaces wear in they increase in the actual surface area in contact which slows down the rate of wear. OK, what's that third time i said that ? I think I'm done here go make some chips !