hello from cooold Ohio! Getting ready to start up another semester and wondering if anyone has had success making homemade "turtle" caster plates - basically a quiet zero throw rotation caster plate that uses 3 or 4 casters on one "lazy susan" or ball bearing assembly. Or anyone tried Teflon and pivot bolt? Looking for a low cost solution to the $250 or more triway swivel caster. I've got a few ideas, just not sure where to find parts or if this may be more trouble than its worth...