Here are some set up instructions posted by John Watson on the long defunct Mana forum:
"BTW, regarding "The Ring or Tone" on Mana. Simply set three of the spikes so that an allen wrench will just fit between glass and frame. This is the proper distance between glass and frame. Leaving one of the front spikes untightened, adjust the height of this spike while tapping on the glass (using your knuckle) mid-way between each group of two spikes (left and right front, front-right and rear-right, etc.) while listening for the quality of the tone or ring. When you hit the ideal or perfect tone (described in a moment), you'll find the quality/duration/pitch stays the same at any of the testing mid-points in the last sentence (this is simply an optional test provided by JW years ago). You also might find it beneficial to tap, say two inches in towards the middle from any spike as well (works especially well if this particular piece of Mana doesn't want to produce an absolute clear tone or "pitch")...believe this one came from our Dev(?) If I remeber correctly the instructions say to tap over the spike--a lot of us found this method useless-the quality of tone sucks no matter what the spike height. Anyway...while you're adjusting this spike, notice the range of travel from too high (glass rattles) to too low (glass rattles). Usually the best, strongest, clearest, most ditinct pitch is mid-way between these two points of spike travel. Once you hit this point, you can't mistake it. On an x-tier amp rack the tone (pitch or "ring") can be so distinct and strong it almost overwhelms all other sounds happening in the room at the time (it almost hurts your ears if your head is close to the glass)! You may find one shelf out of three in a 3-tier only resonates this strong (so don't get paranoid if the other two do not...this is normal). When you hit this point or "quality" of tone...you're done! Lock the nut (only an eighth of a turn or so past finger tight!). If this purest-of-tone can't be achieved on a given shelf (or all shelves) simply adjust the spike height for the best tone this particular shelf can achieve.P.S. Only place one piece of glass on a rack at a time during tuning...which means... you can use just one piece of glass to tune each of the levels (or shelves).This does not affect adjustment and it minimizes glass lying all over the floor during a lengthy installation (less chance for the kids to step on it and break it ;-)
Once you do get Mana setup properly, it won't go out of tune. If this happens it is usually because it was slightly off to begin with, or you have a particularly bad floor or thick carpet.One way to avoid this is just to position the Mana rack where you want it to go, and get it seated firmly on the floor by altering the bottom spikes. Then go to bed and leave it overnight. In the morning any spike sinkage will have already occurred. You can then happily tune the shelves, setup your system, and it should stay perfectly in tune indefinitely.Also, it is worth noting that once you start to add stages it does become less of a hassle. Get the very bottom stage right, and adding new stages and setting the rack up properly becomes dead easy because you have a perfectly level surface to start off with, with no issue of sinkage.
Short spikes, tighten 3 spikes each, then work with one, but if the floor is badly not level, you may have to work with 2 to level the shelves.
No clattering when tapping the glass on all 4 sides where the upward spikes are, finger-tight + just a wee bit of tightening with spanner (tightening with thumb and forefinger, not with your entire fist), tapping on center for that ringing tone."