hi guys, first of all thank you all for being here, i have bought a mactron 2300x1500 and recently i changed the tube, replaced it, because it started to sparkle. i have made the alignments so wherever the laser moving head is the beam enters the hole. there is just one problem, when the head is near to the second mirror it cuts and engraves perfectly, but when i send it on the far end of the machine, the power starts to drop. its driving me crazy. i have worked 3 days in a row trying to figure out. So i would really really appreciate it if i could find some support here thanks in advance