Oval Circles (kinda) when engraving. Why?

I also need to correct the step that occasionally occurs at the laser start/stop position. I know this is most likely a belt tension issue, as I have corrected this previously.

I am curious if there is a more accurate/repeatable way to setting the belt tension than guessing? I know that there are push/pull force gauges that I have seen some people mention in the CNC/Laser community. Would this be a better, more accurate way of setting belt tension? Although kind of spendy for its rare usage, I am willing to purchase one if it makes the procedure easier and more accurate. Here is one I found that.

@alanmccabe made this comment in another post.

I have often wondered how to determine which axis needs to be adjusted based on the location of the lip/step. Not sure if the pluck method is all that accurate. The longer the belt the longer the vibration will last. So I think that he may have found a procedure that works for his specific setup.

@Bonjour mentioned in the same post.

I have tried different tensions and will say that my setup seems to like a slightly tighter tension than just tight enough to not jump off the sprocket.

What is your guys procedure for setting belt tension?