Hi SSS,
You probably alread know about the N-SSA Discussion Forum. From time to time they have threads dealing with Spencer Firearms. You have been invited to visit the North-South Skirmish Association and view and collect any information that might be of interest to you regarding Spencer Firearms. This particular Internet Address will take you to Civil War Firearms.
http://www.n-ssa.org/phpbb/viewforum.php?f=4&sid=5bbb8333f16222de8d7c2a3a40441c1bTwo Flints