Hello,
First have to say - I'm not talking about laser table, but exactly about rail. I have HiWin MGN12C in my cheap Chinese machine and looks like one from rails is a slightly lower on one end - so optical plane is not perfectly flat but looks like a propeller. I can compensate it by dropping one side of the table, but this will have influence on verticality of cut - and I don't like it.

So I need a advice what is a proper way to raise one side of the rail. It is very slight - hard to estimate, but will say 2mm on 70cm. Can I use just standard round washers directly under rail, or I have to raise whole profile which is under rail? I have hard access to bolts, so I'm bit afraid to touch it.

rail-right back_cr2_cr.jpg