Or...you can do it on the cheap...Bubble-wrap .. cellophan all wadded up in a ball , hung from a string (works real good..I know)...than theres the ballon in the middle of the bag of glass ...ooopps did I just say that..
Umm , no.... better not try that one with a high powered device..
Not speaking from experience..dont recommend you try it either..
might not like it .. but sometimes ...well you get the picture anyway.
"My signature has been taken, so Insert another here"
http://repairfaq.ece.drexel.edu/sam/laserfaq.htm
*^_^* aka PhiloUHF