Christy, with all your boot problems (you've had a lot of bad experiences!), have you decided the skate techs (boot fitters and sharpeners) you have used don't meet your standards?
If your local tech puts in all the screws - definitely doesn't sound like a very good tech.
How did you try to check that the edges were level with the spirit level? I can't figure out any way to do that. I guess you could stand the boot upside down on a flat level surface, but in many cases, the top of the boot is not aligned with your leg or foot. Plus it's actually pretty hard to find a surface that is level - though you
could use the spirit level to help you do that.
tstop4me, are all "small machinist's squares" short enough that they won't be obstructed by the parts of the chassis that holds the runners on on Matrix blades? (Of course, if she has first or 3rd generation matrix, with removable runners, she could remove the runners, and apply the square to the runners).
I wonder if to answer that, you need to know what generation Matrix she has. (There have been 3 - the original removable runner ones, then the fixed runner ones, which are now sold at the same time as the RSX later generation removable runners, - which Christy asked about in another thread.) I don't know if the height of the runner that is unobstructed by the chassis is the same for all 3 generations.
I once made do with a cheap plastic square that I cut down to size, on first generation Matrix blades. But that won't work for all plastic squares - some of them don't have a right angle, but have a curve on the inside.
The magnetic levels I've seen only check the level consistency along the blade, not whether there is an overall left-right tilt. But I've used non-magnetic straight edges (or less optimally, Popsicle sticks
) the same way, and just tried to check that the angles were the same on both sides by eye.
Christi could just move the blade, or raise the side of the insole as tstop4me suggests, until she glides straight and on edges the way she wants, and that would probably work. But if the skate tech doesn't sharpen consistently, that would only work until the next sharpening...