I have a GC4 in a room above the garage. I'm no engineer, but it seems that the room was well built. Triple Laminate Beam with 3 columns. House is new, so maybe there is some settling. Underneath table is commercial grade carpet. Unfortunately, I think they put in thick pad. (I insisted on their best pad for the rest of the house - asked for cheapo pad in pool room - I'm pretty sure they put the thick pad everywhere) Pool table has been here over 2 years and we can't seem to keep it level. The place I bought from will come out for free, and they have now 3 times. (Two times to fix slate poping in addition to relevel) They were out last time just a few months ago, but again, the table is now rolling off noticibly. I feel like a nudge to continue to call. Not to mention it takes weeks for them to schedule an appointment. So the question: should I just buy a machinest level and make adjustments myself. How hard is to do? I have never dared touch the leveling casters for fear that I would make things worse and then have to explain myself to a scornful mechanic. If I had the level, is there a system or set of instructions that a non engineer could handle?