I just got my new G0494 16x60 lathe and G9904 10x54 Mill. I installed the 2 axis DRO from Dropros on the lathe. Have not had time to do anything other that install and level. I got the lathe within 0.0002 on the X axis and within o.001 on the Z. I installed the machine feet with the rubber base from grizzly. Does anybody have any experience with these types of leveling feet? How often should you check level? I have a 4 axis DRO for the mill and will install it as soon as I get time. Any tips on installation? This is my first post so I am not sure how this works. I have multiple questions about these machines. The Lathe was suppose to come with the 400 series QC tool post but it arrived with the 300 series. Is there any real advantage of having the 400 series?