I just stumbled upon a place that sells all the individual parts for JT Excellerators:
http://paintball-adventures.com/mcart//index.cgi
As online distributor for Brass Eagle (listed at
http://www.brasseagle.com/eagleville/defaultVendor.asp), they also carry parts for Viewloader products as well (finally, a place I can buy a replacement flip-lid for my 12v revy!). Of course being a distributor the prices aren't that cheap, but hey, if you really need to get that hard-to-find missing part you'd be happy to pay those prices hehe