It funny that Ektelon which made the glide bar machines standard, is a Racquetball company. Though early racquetball racquets were predominantly perpendicular string patterns. Now it's rare to find a new RB racquet that in not a Fan Pattern. That's probably why they re-branded their machines to Prince NEOS, and they include floating clamps with the NEOS 1000. Why sell a machine that you can't string your own brand of rackets on?
Machines: Gamma 6004 2-point w/ Wise 2086 & Babolat Sensor Dual