i found that installing a bar that extended between the mill posts above the rollers, made it easier to get a good pressure horizontally and vertically when pushing the unit along. It also allowed for a more upright positioning for yourself. Just pushing on the saw I don't think is the ideal, and it can force you into a squatting or bent over position the whole way. It is nice to have some alternative positioning available to help reduce fatigue. I made the bar out of a large wooden dowel, attached by encased at the ends in some blocks and bolted to the posts. You need a full on throttle lock rigged up if not holding on to the saw. I also think that the bar oil that a saw puts out can be insufficient for milling, though some mills come with a separate oil tank and drip system, some don't. You can install your own oil tank and dripper. It makes for more bulk and weight on the mill, but I believe is preferable for wide milling. Heat on a chain is a big thing going on when milling. If you could extend the rollers to more contact along the length of the log, I think would be good, especially with a large mill, entering and exiting the cut would be better.
I mean a mill will work well right out of the box, so to speak, but after a long time using one, ideas can pop up. Some parts might need to be improved on. My Sperber Mill is a good one, but the thread lock on the roller elevation is plastic that breaks quite easily.
