Why can't I do this with my stand?

[kien]

It does depend greatly on how large a system (tank/stand) you are planning on putting on those feet. I would be very concerned about supporting a heavy (ish) tank/stand on the threads of those feet. They could possibly warp and possible sheer over time and cause unevenness ? Furthermore, if the feet are extended I would not think that your tank/stand would be very stable on those 4 thin(ish) bolts.